Page - 429 - in The Complete Plato

SOCRATES: Let me now invite you to consider what Hermogenes and I were saying about sounds. Do you agree with me that the letter rho is expressive of rapidity, motion, and hardness? Were we right or wrong in saying so? CRATYLUS: I should say that you were right. SOCRATES: And that lamda was expressive of smoothness, and softness, and the like? CRATYLUS: There again you were right. SOCRATES: And yet, as you are aware, that which is called by us sklerotes, is by the Eretrians called skleroter. CRATYLUS: Very true. SOCRATES: But are the letters rho and sigma equivalents; and is there the same significance to them in the termination rho, which there is to us in sigma, or is there no significance to one of us? CRATYLUS: Nay, surely there is a significance to both of us. SOCRATES: In as far as they are like, or in as far as they are unlike? CRATYLUS: In as far as they are like. SOCRATES: Are they altogether alike? CRATYLUS: Yes; for the purpose of expressing motion. SOCRATES: And what do you say of the insertion of the lamda? for that is expressive not of hardness but of softness. CRATYLUS: Why, perhaps the letter lamda is wrongly inserted, Socrates, and should be altered into rho, as you were saying to Hermogenes and in my opinion rightly, when you spoke of adding and subtracting letters upon occasion. SOCRATES: Good. But still the word is intelligible to both of us; when I say skleros (hard), you know what I mean. 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? 429