Plotinos: Complete Works, v. 3 In Chronological Order,...

Moreover, whence is derived the unification of matter? Matter is not unity, but it participates in unity. They would have had to realize that the material mass is not anterior to everything, and that the first rank pertains to what is not one mass, to Unity itself. Then they would have to descend from Unity to multiplicity, from what is size-less to actual sizes; since, if size be one, it is not because it is Unity itself, but only because it participates in unity. We must therefore recognize that what possesses primary and absolute existence is anterior to what exists contingently. But how does contingency itself exist? What is its mode of existence? If the Stoics had examined this point, they would have finally hit upon (the absolute Unity) which is not unity merely contingently. By this expression is here meant what is not one by itself, but by others.