Glorious Son JESUS

But when the fullness of the time had come, God sent forth His Son, born of a woman, born under the law, to redeem those who were under the law, that we might receive the adoption as sons. (Gal.5:4-5)

God's mystery in Christ:
And without controversy great is the mystery of godliness:
God was manifested in the flesh,
Justified in the Spirit,
Seen by angels,
Preached among the Gentiles,
Believed on in the world,
Received up in glory. (1Tim.3:16)

Christ mystery in us (children of God):

Glorious God Son born of a woman so that we who was born of woman would not be called sons of woman anymore, but sons of GOD*...

Amazing God's Son became Son of man that we sons of man became sons of God.
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* (sons in meaning children of God, with other words both sons and daughters)