The Republic by Plato Part 4 Page 68

And might a man be thirsty, and yet unwilling to drink?

Yes, he said, it constantly happens.

And in such a case what is one to say? Would you not say that there was something in the soul bidding a man to drink, and something else forbidding him, which is other and stronger than the principle which bids him?

I should say so.

And the forbidding principle is derived from reason, and that which bids and attracts proceeds from passion and disease?

Clearly.

Then we may fairly assume that they are two, and that they differ from one another; the one with which a man reasons, we may call the rational principle of the soul, the other, with which he loves and