"But if any one demand here, where this [Greek: a)ki/nêtos ou)si/a], these immutable entities do exist? I answer, first, that as they are considered formally, they do not properly exist in the individuals without us, as if they were from them imprinted upon the understanding, which some have taken to be Aristotle's opinion; because no individual material thing is either universal or immutable. And if these things were only lodged in the individual sensibles, then they would be unavoidably obnoxious to the fluctuating waves of the same reciprocating Euripus, in which all individual material things are perpetually whirled. But because {256} they perish not together with them, it is a certain argument that they exist independently upon them. Neither in the next place, do they exist somewhere else apart from the individual sensibles, and without the mind, which is that opinion that Aristotle justly condemns, but either unjustly or unskilfully attributes to Plato. For if the mind looked abroad for its objects wholly without itself, then all its knowledge would be nothing but sense and passion. For to know a thing is nothing else but to comprehend it by some inward ideas that are domestic to the mind, and actively exerted from it. Wherefore these intelligible ideas or essences of things, those forms by which we understand all things, exist no where but in the mind itself; for it was very well determined long ago by Socrates, in Plato's Parmenides, that these things are nothing but _noëmata_: these species or ideas are all of them nothing but _noëmata_, or notions that exist no where but in the soul itself.' Wherefore, to say that there are immutable natures and essences, and *_rationes_ of things, distinct from the individuals that exist without us, is all one as if one should say, that there is in the universe above the orb of matter and body, another superior orb of intellectual being, that comprehends its own immediate objects, that is, the immutable _rationes_ and ideas of things within itself, by which it understands and knows all things without itself. "And yet notwithstanding though these things exist only in the mind, they are not therefore mere figments of the understanding: for if the subjects of all scientifical theorems were nothing but figments, then all truth and knowledge that is built upon them would {257} be a mere fictitious thing; and if truth itself, and the intellectual nature be fictitious things, then what can be real or solid in the world? But it is evident, that though the mind thinks of these things at pleasure, yet they are not arbitrarily framed by the mind, but have certain, determinate, and immutable natures of their own, which are independent upon the mind, and which are not blown away into nothing at the pleasure of the same being that arbitrarily made them.