  Spinoza makes a very important claim about attributes in the Scholium to Proposition 10 of Part One: “…although two attributes may be conceived to be really distinct (i.e., one may be conceived without the aid of the other), we still cannot infer from that that they constitute two beings, or two different substances.” Spinoza here is explaining something about the relationship among attributes—one may be conceived without the aid of the other—and about the relation of the attributes to the substance, namely, that conceiving attributes independently is not evidence of the existence of independent substances.