John of Damascus — on Ezek 44:3 (BARLAAM AND JOSEPH 7)

“Without seed the Son of God was conceived of the Holy Spirit, and in the Virgin's womb he formed for himself a fleshly body, animate with a reasonable and intelligent soul. From it [he came] forth in one substance but in two natures, perfect God and perfect man. It preserved undefiled, even after birth, the virginity of her that bore him. Being made of like passions with ourselves in all things, yet without sin, he took our infirmities and bore our sicknesses. For, since by sin death entered into the world, he who was to redeem the world had to be without sin, and not by sin subject to death.”