And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth.
John 1:14 ESV
Incarnation means enfleshment: Jesus Christ is God in human flesh. The great act of God: the second person of the Trinity, the Son of God, took upon himself our human nature. Incarnation means that God is with us, near us, transforming us. The incarnation means that God cared and came among us to deliver us from ourselves.
Jesus Christ is God-Man. God in Essence cannot come anywhere near us. Almighty God does not matter to me, He is in the clouds. To be of any use to me, He must come down to the domain in which I live; and I do not live in the clouds but on the earth. The doctrine of the Incarnation is that God did come down into our domain.
The Wisdom of God, the Word of God, the exact expression of God, was manifest in the flesh. That is the great doctrine of the New Testament—dust and Deity made one. The pure gold of Deity is of no use to us unless it is amalgamated in the right alloy, viz. the pure Divine working on the basis of the pure human: God and humanity one, as in Our Lord Jesus Christ.
Oswald Chambers, Shade of His Hand: Talks on the Book of Ecclesiastes (Hants UK: Marshall, Morgan & Scott, 1936).