2p16d.md (444B)
1 All the modes, in which any given body is affected, 2 follow from the nature of the body affected, and also from the 3 nature of the affecting body (by Ax. i., after the Coroll. of 4 Lemma iii.), wherefore their idea also necessarily (by I. Ax. 5 iv.) involves the nature of both bodies; therefore, the idea of 6 every mode, in which the human body is affected by external 7 bodies, involves the nature of the human body and of the external 8 body. Q.E.D. 9 10