Martin Luther

On the Divinity and Humanity of Christ

Chapter 27

Against [propositions] 11 and 12.

"Thou tookest man upon thee to deliver him." But strictly speaking [proprie], God either assumed human nature or humanity or man. But strictly speaking he did not assume humanity or human nature. Therefore he assumed a man, because humanity is an abstract and signifies only a form, but human nature signifies matter, that is, flesh and soul. But God strictly speaking did not assume flesh and a soul, nor flesh alone or a soul alone, but a man, which is the general and most appropriate term in this matter. Therefore I say that he assumed a whole man [integrum hominem], not simply humanity or a part thereof.

Response: When humanity is used, as above, as a philosophical term, it is the same as man, but in theology it does not signify a person, as "man" signifies a person, that is, a particular person, [if we were to say] that the Son of God assumed a man. If it were said that the divine person assumed a human nature, that is, a person, then there would be two persons, which we do not concede. For there are not two substances, etc.

"Thou tookest man upon thee to deliver him." Here everyone answers that man is here taken abstractly, that is, as "humanity," which is not subsistent, but assumed. "Man," however, does not signify something assumed, but an existing person. Therefore "man" has a different signification with regard to Christ. Christ is a man, that is, the divine person which assumed human nature, for the person did not assume a person. In philosophy there is no difference between man and the union of a soul and flesh, but in theology there is a great difference. For in Christ, humanity signifies the assumed, not subsistent, human nature. But "man" signifies a subsistent person.