1 Jn 1:1-2, Gen 3:15, Eph 3:3-4, Col 1:26-27, Col 2:2, 1 Pt 1:20-21, Rom 1:2
God began to communicate the mystery of Christ to us through the prophet Moses. (Gen 3:15)
Gen 3:15 And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.
Since the world began, God has delivered to us the revelation of the mystery of God through the writings of the prophets. Now this revelation has come to us. The Christ prophesied by the prophets is Jesus. (Rom 1:2, Rom 16:25-27, 1 Jn 1:1-2, Col 1:26-27, 1 Pt 1:20-21)
Rom 1:2 (Which he had promised afore by his prophets in the holy scriptures,)
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, 26 But now is made manifest, and by the scriptures of the prophets, according to the commandment of the everlasting God, made known to all nations for the obedience of faith: 27 To God only wise, be glory through Jesus Christ for ever. Amen.
1 Jn 1:1 That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the Word of life; 2 (For the life was manifested, and we have seen it, and bear witness, and shew unto you that eternal life, which was with the Father, and was manifested unto us;)
Col 1:26 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:
1 Pt 1:20 Who verily was foreordained before the foundation of the world, but was manifest in these last times for you, 21 Who by him do believe in God, that raised him up from the dead, and gave him glory; that your faith and hope might be in God.
God made Paul realize the revelation of God. In other words, Paul realized that Jesus was the Christ. (Ep 3:3-4)
Ep 3:3 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)
Christ is the mystery of God. In other words, the mystery of God's saving work is contained in Christ. (Col 2:2)
Col 2:2 That their hearts might be comforted, being knit together in love, and unto all riches of the full assurance of understanding, to the acknowledgement of the mystery of God, and of the Father, and of Christ;