And will not the something which is apprehended as one and the same in all, be an idea? From that, again, there is no escape. Then, said Parmenides, if you say that everything else participates in the ideas, must you not say either that everything is made up of thoughts, and that all things think; or that they are thoughts but have no thought? The latter view, Parmenides, is no more rational than the previous one. In my opinion, the ideas are, as it were, patterns fixed in nature, and other things are like them, and resemblances of them--what is meant by the participation of other things in the ideas, is really assimilation to them. But if, said he, the individual is like the idea, must not the idea also be like the individual, in so far as the individual is a resemblance of the idea? That which is like, cannot be conceived of as other than the like of like. Impossible. And when two things are alike, must they not partake of the same idea? They must. And will not that of which the two partake, and which makes them alike, be the idea itself? Certainly. Then the idea cannot be like the individual, or the individual like the idea; for if they are alike, some further idea of likeness will always be coming to light, and if that be like anything else, another; and new ideas will be always arising, if the idea resembles that which partakes of it? Quite true. The theory, then, that other things participate in the ideas by resemblance, has to be given up, and some other mode of participation devised? It would seem so. Do you see then, Socrates, how great is the difficulty of affirming the ideas to be absolute? Yes, indeed. And, further, let me say that as yet you only understand a small part of the difficulty which is involved if you make of each thing a single idea, parting it off from other things. What difficulty? he said. There are many, but the greatest of all is this:--If an opponent argues that these ideas, being such as we say they ought to be, must remain unknown, no one can prove to him that he is wrong, unless he who denies their existence be a man of great ability and knowledge, and is willing to follow a long and laborious demonstration; he will remain unconvinced, and still insist that they cannot be known. What do you mean, Parmenides? said Socrates. In the first place, I think, Socrates, that you, or any one who maintains the existence of absolute essences, will admit that they cannot exist in us. No, said Socrates; for then they would be no longer absolute.