“The Word became flesh and dwelt among us.” (John 1:14)
God doesn’t need the incarnation any more than He needs the world. He would be the same infinitely joyful, infinitely lively and infinitely satisfied God if we had never existed and if Jesus had never been born.
God doesn’t need the incarnation, but the incarnation is not alien to God. God is boundlessly good, with a goodness that is infinite love. He is a ring of self-giving love from Father to Spirit to Son to Spirit to Father. Philanthropy—love for humans—comes naturally to the Triune God, the fitting expression of the goodness God is.
His Triune goodness is displayed in His willingness to become flesh and “mingle” with us (Nyssa). . . . Our good is to mingle with Him.
—Peter Leithart (blog post)