-------On the Word Became Flesh----- Martin Luther, 1483-1546---------------------
From: Sermo Lutheri in natali Christi, [December 25, 1514]) D. Martin Luthers Werke. Kritische Gesammtausgabe_ (Weimar: Hermann Boehlau, 1883) Vol. 1, p. 28.

Just as the Word of God became flesh, it is also certainly necessary to say that the flesh became Word. For the Word became flesh in order that the flesh might become Word. That is, God becomes man in order that man might become God. Likewise strength becomes weakness in order that weakness might become strength. He put on our form and figure and image and likeness in order that He might clothe us with His image, form and likeness. For wisdom becomes foolishness in order that foolishness might become wisdom; and likewise in all other things pertaining to God and to us, in all of them He took on what is ours in order to give us what is His.