Have this mind among yourselves, which is yours in Christ Jesus,
who, though he was in the form of God, did not count equality with
God a thing to be grasped, but emptied himself, taking the form of a
servant, being born in the likeness of men. And being found in
human form he humbled himself and became obedient unto death,
even death on a cross.
No. 464:
The unique and all together singular event of the
Incarnation of the Son of God does not mean that Jesus Christ is part God
and part man, nor does it imply that he is the result of a confused mixture
of the divine and the human. He became truly man while remaining truly
God. Jesus Christ is true God and true man. During the first centuries, the
Church had to defend and clarify this truth of faith against the heresies that
falsified it.
No. 469:
The Church thus confesses that Jesus is inseparably true
God and true man. He is truly the Son of God who, without ceasing to be
God and Lord, became a man and our brother:
What he was, he remained and what he was not, he assumed,
sings the Roman Liturgy. And the Liturgy of St. John Chrysostom
proclaims and sings: O only-begotten Son and Word of God,
immortal being, you who deigned for our salvation to become
incarnate of the holy Mother of God and ever-virgin Mary, you
who without change became man and were crucified, O Christ our
God, you who by your death have crushed death, you who are one
of the Holy Trinity, glorified with the Father and the Holy Spirit,
save us! (Troparion O monogenes).