1p5d.md (742B)
1 If several distinct substances be granted, they must 2 be distinguished one from the other, either by the difference of 3 their attributes, or by the difference of their modifications 4 (Prop. iv.). If only by the difference of their attributes, it 5 will be granted that there cannot be more than one with an 6 identical attribute. If by the difference of their 7 modifications–as substance is naturally prior to its 8 modifications (Prop. i.),–it follows that setting the 9 modifications aside, and considering substance in itself, that is 10 truly, (Deff. iii. and vi.), there cannot be conceived one 11 substance different from another,–that is (by Prop. iv.), there 12 cannot be granted several substances, but one substance only. 13 Q.E.D. 14 15