13. But we can hence perceive a little more clearly that what the memory stores up and retains is a different thing from that which is thence copied in the conception of the man who remembers, although, when both are combined together, they appear to be one and the same; because we can only remember just as many species of bodies as we have actually seen, and so great, and such, as we have actually seen; for the mind imbibes them into the memory from the bodily sense; whereas the things seen in conception, although drawn from those things which are in the memory, yet are multiplied and varied innumerably, and altogether without end. For I remember, no doubt, but one sun, because according to the fact, I have seen but one; but if I please, I conceive of two, or three, or as many as I will; but the vision of my mind, when I conceive of many, is formed from the same memory by which I remember one. And I remember it just as large as I saw it. For if I remember it as larger or smaller than I saw it, then I no longer remember what I saw, and so I do not remember it. But because I remember it, I remember it as large as I saw it; yet I conceive of it as greater or as less according to my will. And I remember it as I saw it; but I conceive of it as running its course as I will, and as standing still where I will, and as coming whence I will, and whither I will. For it is in my power to conceive of it as square, although I remember it as round; and again, of what color I please, although I have never seen, and therefore do not remember, a green sun; and as the sun, so all other things. But owing to the corporeal and sensible nature of these forms of things, the mind falls into error when it imagines them to exist without, in the same mode in which it conceives them within, either when they have already ceased to exist without, but are still retained in the memory, or when in any other way also, that which we remember is formed in the mind, not by faithful recollection, but after the variations of thought.