1p4d.md (436B)
1 Everything which exists, exists either in itself or in 2 something else (Ax. i.),–that is (by Deff. iii. and v.), nothing 3 is granted in addition to the understanding, except substance and 4 its modifications. Nothing is, therefore, given besides the 5 understanding, by which several things may be distinguished one 6 from the other, except the substances, or, in other words (see 7 Ax. iv.), their attributes and modifications. Q.E.D. 8 9