Plato: The Republic

4. BOOK IV (continued)

Well, I said, and hunger and thirst, and the desires in general, and again willing and wishing,--all these you would refer to the classes already mentioned. You would say--would you not?--that the soul of him who desires is seeking after the object of his desires; or that he is drawing to himself the thing which he wishes to possess: or again, when a person wants anything to be given him, his mind, longing for the realisation of his desires, intimates his wish to have it by a nod of assent, as if he had been asked a question?

Very true.

And what would you say of unwillingness and dislike and the absence of desire; should not these be referred to the opposite class of repulsion and rejection?

Certainly.

Admitting this to be true of desire generally, let us suppose a particular class of desires, and out of these we will select hunger and thirst, as they are termed, which are the most obvious of them?

Let us take that class, he said.

The object of one is food, and of the other drink?

Yes.

And here comes the point: is not thirst the desire which the soul has of drink, and of drink only; not of drink qualified by anything else; for example, warm or cold, or much or little, or, in a word, drink of any particular sort: but if the thirst be accompanied by heat, then the desire is of cold drink; or, if accompanied by cold, then of warm drink; or, if the thirst be excessive, then the drink which is desired will be excessive; or, if not great, the quantity of drink will also be small: but thirst pure and simple will desire drink pure and simple, which is the natural satisfaction of thirst, as food is of hunger?

Yes, he said; the simple desire is, as you say, in every case of the simple object, and the qualified desire of the qualified object.