"What good does it do to speak learnedly about the Trinity if, lacking humility, you displease the Trinity? Indeed it is not learning that makes a man holy and just, but a virtuous life makes him pleasing to God. "

Thomas á Kempis

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"The Lord has always revealed to mortals the treasures of his wisdom and his spirit, but now that the face of evil bares itself more and more, so does the Lord bare his treasures more."

St John of the Cross, OCD - Doctor of the Church

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"The more you know and the better you understand, the more severely will you be judged, unless your life is also the more holy. Do not be proud, therefore, because of your learning or skill. Rather, fear because of the talent given you."

Thomas á Kempis

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"I am the Way, the Truth and the Life"  - John 14:6

The Incarnation

IN BRIEF

At the time appointed by God, the only Son of the Father, the eternal Word, that is, the Word and substantial Image of the Father, became incarnate; without losing his divine nature he has assumed human nature.

Jesus Christ is true God and true man, in the unity of his divine person; for this reason he is the one and only mediator between God and men.

Jesus Christ possesses two natures, one divine and the other human, not confused, but united in the one person of God's Son.

Christ, being true God and true man, has a human intellect and will, perfectly attuned and subject to his divine intellect and divine will, which he has in common with the Father and the Holy Spirit.

The Incarnation is therefore the mystery of the wonderful union of the divine and human natures in the one person of the Word.

- Paras 479 to 453 of The Catechism of the Catholic Church

For a fuller explanation of this mystery, go to this commentary on the Summa Theologica of St Thomas Aquinas.