The one and the perfect continually overflows, and from it Being, Reason, and Life are perpetually derived, without deducting anything from its substance, inasmuch as it is simple in its nature, and not, like matter, compound. (Enn. iv. ix. 9.) This derivation of all things from unity does not resemble creation, which has reference to time, but takes place purely in conformity with the principles of causality and order, without volition, because to will is to change. (Enn. iv. 5, i. 6)” Tennemann on Plotinus, Hist. Phil. § 207.