everything revealed

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.

What is it that was secret and hidden that shall be manifested and come abroad?

When you look up for the word mystery, there are 27 references that come up in the Accordance Bible software, among them: Mystery of the Gospel, Mystery of the Church and Christ, Mystery of Babylon (Rev 17), The mystery of the seven stars, The Mystery that "We shall not all sleep, but we shall all be changed"(1 Cor 15:51), the mysteries of the kingdom of heaven, etc
But I think that verse mentioned above might be one of these 3 options:

1) The Mystery of Godliness:

1 Timothy 3:16 "And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory."

1Cor. 2:7-10 "7 But we speak the wisdom of God in a mystery, even the hidden wisdom, which God ordained before the world unto our glory: 8 Which none of the princes of this world knew: for had they known it, they would not have crucified the Lord of glory. 9 But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him. 10 But God hath revealed them unto us by his Spirit: for the Spirit searcheth all things, yea, the deep things of God."

Rom. 16:25 "Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began."

Col. 1:26, 27 "26 Even the mystery which hath been hid from ages and from generations, but now is made manifest to his saints: 27 To whom God would make known what is the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory."

2) The Mystery of Iniquity

2 Thessalonians 2:7-9 "7 For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way. 8 And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming: 9 Even him, whose coming is after the working of Satan with all power and signs and lying wonders."

3) The Mystery of the Faith

1 Timothy 3:9 "Holding the mystery of the faith in a pure conscience."

Thanks for the Bible Info