Rudolf Steiner: An Esoteric Lesson given in Hannover, September 24, 1907. From the notes of a participant.
So that we could become aware of our self, our spirit, so that we could become spirit-beings ourself, this high sun-spirit sacrificed himself, left his royal abode, descended from the sun and took on physical raiment in the earth. Thus he is physically crucified in the earth. But he spiritually embraces the earth with his light and his love power, and everything that lives on it belongs to him. He's only waiting for us to want to belong to him. If we give ourselves to him completely then he'll not only give us his physical life, but also his higher spiritual sun-life. Then he streams through us with his divine light-spirit, with his warming waves of love, and with his creative God's will.
We can only be what he gives us, what he makes out of us. Everything about us that corresponds to the divine plan is his work. What can we do in addition to this? Nothing but to let him work in us. It's only if we resist his love that he can't work in us. But how could we resist this love? resist him who says “I have always loved you and have drawn you to me out of pure goodness”? He has loved us since the earth's very beginning. We must let his love become a real being in us. Real life, spirit, and bliss are only possible if this life becomes real life for us, becomes Christ's life in us. We can't become pure and holy by ourselves, but only through this Christ-life. All our striving and wrestling is in vain as long as this higher life doesn't fill us. It alone can wash everything out of our nature that's still unpurified, like a clean, pure stream. This is the soul-ground from which this purifying light-life can ascend. There we must seek our dwelling, at his feet and in devotion to him. Then he will transform us himself and stream through us with his divine love-life until we become illumined and pure as he is, become like him. Until he can share his divine consciousness with us. Our soul must become pure and wise through his light — then it can unite with his life. This then is the union of Christ and Sophia, the union of Christ's life with the human soul that has been purified by his light.