CRATYLUS: Yes, my dear friend, and the explanation of that is custom. SOCRATES: And what is custom but convention? I utter a sound which I understand, and you know that I understand the meaning of the sound: this is what you are saying? CRATYLUS: Yes. SOCRATES: And if when I speak you know my meaning, there is an indication given by me to you? CRATYLUS: Yes. SOCRATES: This indication of my meaning may proceed from unlike as well as from like, for example in the lamda of sklerotes. But if this is true, then you have made a convention with yourself, and the correctness of a name turns out to be convention, since letters which are unlike are indicative equally with those which are like, if they are sanctioned by custom and convention. And even supposing that you distinguish custom from convention ever so much, still you must say that the signification of words is given by custom and not by likeness, for custom may indicate by the unlike as well as by the like. But as we are agreed thus far, Cratylus (for I shall assume that your silence gives consent), then custom and convention must be supposed to contribute to the indication of our thoughts; for suppose we take the instance of number, how can you ever imagine, my good friend, that you will find names resembling every individual number, unless you allow that which you term convention and agreement to have authority in determining the correctness of names? I quite agree with you that words should as far as possible resemble things; but I fear that this dragging in of resemblance, as Hermogenes says, is a shabby thing, which has to be supplemented by the mechanical aid of convention with a view to correctness; for I believe that if we could always, or almost always, use likenesses, which are perfectly appropriate, this would be the most perfect state of language; as the opposite is the most imperfect. But let me ask you, what is the force of names, and what is the use of them? CRATYLUS: The use of names, Socrates, as I should imagine, is to inform: the simple truth is, that he who knows names knows also the things which are expressed by them. SOCRATES: I suppose you mean to say, Cratylus, that as the name is, so also is the thing; and that he who knows the one will also know the other, because they are similars, and all similars fall under the same art or science; and therefore you would say that he who knows names will also know things. CRATYLUS: That is precisely what I mean. SOCRATES: But let us consider what is the nature of this information about things which, according to you, is given us by names. Is it the best sort of information? or is there any other? What do you say? CRATYLUS: I believe that to be both the only and the best sort of information about them; there can be no other.