God's revelation refers to the ways in which God has chosen to disclose Himself, His Word and His will to humanity. This concept is foundational to understanding the nature of God, His purposes, and His interactions with the world. Revelation is generally categorized into two types: general revelation and special revelation.

General revelation is the knowledge of God and His attributes that can be discerned through nature, history, and human conscience. It is accessible to all people, regardless of their religious background. The Apostle Paul speaks of this in Romans 1:20.

Romans 1:20

For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:

Psa.19:1-11

[1] The heavens declare the glory of God; and the firmament sheweth his handywork.
[2] Day unto day uttereth speech, and night unto night sheweth knowledge.
[3] There is no speech nor language, where their voice is not heard.
[4] Their line is gone out through all the earth, and their words to the end of the world. In them hath he set a tabernacle for the sun,
[5] Which is as a bridegroom coming out of his chamber, and rejoiceth as a strong man to run a race.
[6] His going forth is from the end of the heaven, and his circuit unto the ends of it: and there is nothing hid from the heat thereof.
[7] The law of the LORD is perfect, converting the soul: the testimony of the LORD is sure, making wise the simple.
[8] The statutes of the LORD are right, rejoicing the heart: the commandment of the LORD is pure, enlightening the eyes.
[9] The fear of the LORD is clean, enduring for ever: the judgments of the LORD are true and righteous altogether.
[10] More to be desired are they than gold, yea, than much fine gold: sweeter also than honey and the honeycomb.
[11] Moreover by them is thy servant warned: and in keeping of them there is great reward.

Special revelation is something that happens between God and man.  It is God  speaking (or revealing something) to a person whether it be through an agent such as Jesus or an angel or a dream or a vision.  Any of these would be considered a type of special revelation from God.

Special revelation refers to God's specific communications and manifestations to particular individuals or groups, which are not accessible through general revelation. This includes the Scriptures, the person of Jesus Christ, and other direct communications from God.  

Special revelation to the 12 disciples (later named apostles by Jesus)

Mark 4:10-34

[10] And when he was alone, they that were about him with the twelve asked of him the parable.
[11] And he said unto them, Unto you it is given to know the mystery of the kingdom of God: but unto them that are without, all these things are done in parables:
[12] That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.
[13] And he said unto them, Know ye not this parable? and how then will ye know all parables?
[14] The sower soweth the word.
[15] And these are they by the way side, where the word is sown; but when they have heard, Satan cometh immediately, and taketh away the word that was sown in their hearts.
[16] And these are they likewise which are sown on stony ground; who, when they have heard the word, immediately receive it with gladness;
[17] And have no root in themselves, and so endure but for a time: afterward, when affliction or persecution ariseth for the word's sake, immediately they are offended.
[18] And these are they which are sown among thorns; such as hear the word,
[19] And the cares of this world, and the deceitfulness of riches, and the lusts of other things entering in, choke the word, and it becometh unfruitful.
[20] And these are they which are sown on good ground; such as hear the word, and receive it, and bring forth fruit, some thirtyfold, some sixty, and some an hundred.
[21] And he said unto them, Is a candle brought to be put under a bushel, or under a bed? and not to be set on a candlestick?
[22] For there is nothing hid, which shall not be manifested; neither was any thing kept secret, but that it should come abroad.
[23] If any man have ears to hear, let him hear.
[24] And he said unto them, Take heed what ye hear: with what measure ye mete, it shall be measured to you: and unto you that hear shall more be given.
[25] For he that hath, to him shall be given: and he that hath not, from him shall be taken even that which he hath.
[26] And he said, So is the kingdom of God, as if a man should cast seed into the ground;
[27] And should sleep, and rise night and day, and the seed should spring and grow up, he knoweth not how.
[28] For the earth bringeth forth fruit of herself; first the blade, then the ear, after that the full corn in the ear.
[29] But when the fruit is brought forth, immediately he putteth in the sickle, because the harvest is come.
[30] And he said, Whereunto shall we liken the kingdom of God? or with what comparison shall we compare it?
[31] It is like a grain of mustard seed, which, when it is sown in the earth, is less than all the seeds that be in the earth:
[32] But when it is sown, it groweth up, and becometh greater than all herbs, and shooteth out great branches; so that the fowls of the air may lodge under the shadow of it.
[33] And with many such parables spake he the word unto them, as they were able to hear it.
[34] But without a parable spake he not unto them: and when they were alone, he expounded all things to his disciples.

Special revelation to the replacement apostle (Paul)

Although the 11 selected a temporary replacement for Judas in choosing a replacement (Acts 1:15-26), it seems like God had a special hand upon Saul of Tarsus and he became the permanent replacement for Judas Iscariot.  (Acts 1:15-26)  

Nearly 50% of the New Testament books and about 25% of the total words of the New Testament were written by Paul.   This is why I say it appears that he took  the bishopric over that Judas Iscariot vacated.  (Acts 1:20)

Saul of Tarsus had been the leading persecutor of the Church of Jesus Christ as we read in the 7th and 8th chapters of Acts.

Acts 9:1-6

[1] And Saul, yet breathing out threatenings and slaughter against the disciples of the Lord, went unto the high priest,
[2] And desired of him letters to Damascus to the synagogues, that if he found any of this way, whether they were men or women, he might bring them bound unto Jerusalem.
[3] And as he journeyed, he came near Damascus: and suddenly there shined round about him a light from heaven:
[4] And he fell to the earth, and heard a voice saying unto him, Saul, Saul, why persecutest thou me?
[5] And he said, Who art thou, Lord? And the Lord said, I am Jesus whom thou persecutest: it is hard for thee to kick against the pricks.
[6] And he trembling and astonished said, Lord, what wilt thou have me to do? And the Lord said unto him, Arise, and go into the city, and it shall be told thee what thou must do.

Acts 9:7-20

[7] And the men which journeyed with him stood speechless, hearing a voice, but seeing no man.
[8] And Saul arose from the earth; and when his eyes were opened, he saw no man: but they led him by the hand, and brought him into Damascus.
[9] And he was three days without sight, and neither did eat nor drink.
[10] And there was a certain disciple at Damascus, named Ananias; and to him said the Lord in a vision, Ananias. And he said, Behold, I am here, Lord.
[11] And the Lord said unto him, Arise, and go into the street which is called Straight, and inquire in the house of Judas for one called Saul, of Tarsus: for, behold, he prayeth,
[12] And hath seen in a vision a man named Ananias coming in, and putting his hand on him, that he might receive his sight.
[13] Then Ananias answered, Lord, I have heard by many of this man, how much evil he hath done to thy saints at Jerusalem:
[14] And here he hath authority from the chief priests to bind all that call on thy name.
[15] But the Lord said unto him, Go thy way: for he is a chosen vessel unto me, to bear my name before the Gentiles, and kings, and the children of Israel:
[16] For I will shew him how great things he must suffer for my name's sake.
[17] And Ananias went his way, and entered into the house; and putting his hands on him said, Brother Saul, the Lord, even Jesus, that appeared unto thee in the way as thou camest, hath sent me, that thou mightest receive thy sight, and be filled with the Holy Ghost.
[18] And immediately there fell from his eyes as it had been scales: and he received sight forthwith, and arose, and was baptized.
[19] And when he had received meat, he was strengthened. Then was Saul certain days with the disciples which were at Damascus.
[20] And straightway he preached Christ in the synagogues, that he is the Son of God.

2 Cor. 12:1-12

[1] It is not expedient for me doubtless to glory. I will come to visions and revelations of the Lord.
[2] I knew a man in Christ above fourteen years ago, (whether in the body, I cannot tell; or whether out of the body, I cannot tell: God knoweth;) such an one caught up to the third heaven.
[3] And I knew such a man, (whether in the body, or out of the body, I cannot tell: God knoweth;)
[4] How that he was caught up into paradise, and heard unspeakable words, which it is not lawful for a man to utter.
[5] Of such an one will I glory: yet of myself I will not glory, but in mine infirmities.
[6] For though I would desire to glory, I shall not be a fool; for I will say the truth: but now I forbear, lest any man should think of me above that which he seeth me to be, or that he heareth of me.
[7] And lest I should be exalted above measure through the abundance of the revelations, there was given to me a thorn in the flesh, the messenger of Satan to buffet me, lest I should be exalted above measure.
[8] For this thing I besought the Lord thrice, that it might depart from me.
[9] And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me.
[10] Therefore I take pleasure in infirmities, in reproaches, in necessities, in persecutions, in distresses for Christ's sake: for when I am weak, then am I strong.
[11] I am become a fool in glorying; ye have compelled me: for I ought to have been commended of you: for in nothing am I behind the very chiefest apostles, though I be nothing.
[12] Truly the signs of an apostle were wrought among you in all patience, in signs, and wonders, and mighty deeds.

Gal. 1:11-12

[11] But I certify you, brethren, that the gospel which was preached of me is not after man.
[12] For I neither received it of man, neither was I taught it, but by the revelation of Jesus Christ.

Ephesians 2:19-22

[19] Now therefore ye are no more strangers and foreigners, but fellowcitizens with the saints, and of the household of God;
[20] And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone;
[21] In whom all the building fitly framed together groweth unto an holy temple in the Lord:
[22] In whom ye also are builded together for an habitation of God through the Spirit.

Special revelation to the New Testament Apostles and Prophets

What's the difference?

Apostles were directly chosen by Jesus Christ. Prophets were extensions of the apostolic office and became thus by having their hands laid upon them formally by one or more of the Apostles.

Acts 6:1-8

[1] And in those days, when the number of the disciples was multiplied, there arose a murmuring of the Grecians against the Hebrews, because their widows were neglected in the daily ministration.
[2] Then the twelve called the multitude of the disciples unto them, and said, It is not reason that we should leave the word of God, and serve tables.
[3] Wherefore, brethren, look ye out among you seven men of honest report, full of the Holy Ghost and wisdom, whom we may appoint over this business.
[4] But we will give ourselves continually to prayer, and to the ministry of the word.
[5] And the saying pleased the whole multitude: and they chose Stephen, a man full of faith and of the Holy Ghost, and Philip, and Prochorus, and Nicanor, and Timon, and Parmenas, and Nicolas a proselyte of Antioch:
[6] Whom they set before the apostles: and when they had prayed, they laid their hands on them.
[7] And the word of God increased; and the number of the disciples multiplied in Jerusalem greatly; and a great company of the priests were obedient to the faith.
[8] And Stephen, full of faith and power, did great wonders and miracles among the people.

The 12 chose seven assistants  to help them  minister to the Jerusalem Church.  We are only given the histories of two of these in the book of Acts (Steven and Phillip).  Both of them became miracle workers  just like the apostles.   These men, however, were not Apostles because they were not directly called by Jesus Christ,  and we have no record that they saw the resurrected Christ.  They were ordained by the apostles which made them New Testament prophets.  They were endued with the same  prophetic powers as well as the ability to work wonders and miracles just like the apostles. 

The prophet Steven

read Acts chapter 7

The prophet Philip

read Acts chapter 8

Note Where the Chain Stopped!

Philip was preaching in Samaria and working miracles and the Samaritans received the gospel but Philip did not lay his hands upon them and impart spiritual gifts to them because he was not an apostle they had to send back to Jerusalem to have some of the Apostles come to the Samaritans and endue with the gifts of the Holy Spirit. (read Acts chapters 7,8 & 9)  

When word of Philip the evangelist's success  in Samaria reached the Jerusalem Church, they sent Peter and John (apostles)  to these Samaritan believers so they could receive the gifts of the Holy Spirit. 

How were the New Testament Mysteries were revealed to the church?

It seems apparent that there were a total of four Apostolic writers and eight prophetic writers (12 writers in total) whose writing comprise what we know as New Testament of Jesus Christ.

Ephesians 3:1-7

[1] For this cause I Paul, the prisoner of Jesus Christ for you Gentiles,
[2] If ye have heard of the dispensation of the grace of God which is given me to youward:
[3] How that by revelation he made known unto me the mystery; (as I wrote afore in few words,
[4] Whereby, when ye read, ye may understand my knowledge in the mystery of Christ)
[5] Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the Spirit;
[6] That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel:
[7] Whereof I was made a minister, according to the gift of the grace of God given unto me by the effectual working of his power.

Paul was earnest to get to the city of Rome and to minister to the Roman Church in person so he could impart spiritual gifts to that body of believers.

Rom. 1:9-11

[9] For God is my witness, whom I serve with my spirit in the gospel of his Son, that without ceasing I make mention of you always in my prayers;
[10] Making request, if by any means now at length I might have a prosperous journey by the will of God to come unto you.
[11] For I long to see you, that I may impart unto you some spiritual gift, to the end ye may be established;

It is clear that the apostles (here referred to as the elders or presbytery) gave Timothy spiritual gifts by laying their hands upon him thus ordaining him as one of their assistants and extensions to theirbministry and Timothy became a prophet.

1 Tim. 4:12-14

[12] Let no man despise thy youth; but be thou an example of the believers, in word, in conversation, in charity, in spirit, in faith, in purity.
[13] Till I come, give attendance to reading, to exhortation, to doctrine.
[14] Neglect not the gift that is in thee, which was given thee by prophecy, with the laying on of the hands of the presbytery.