In Book IV of the Republic Socrates is arguing that the soul, like the city, has parts, and he takes the case of a man who is thirsty and yet unwilling to drink. He distinguishes a “rational principle” from the “irrational or appetitive” and treats the opposition as proof that they are two. The passage stands under this term as the first division of the soul on which later accounts of will depend.
Read in contextAnd 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 hungers and thirsts and feels the flutterings of any other desire, may be termed the irrational or appetitive, the ally of sundry pleasures and satisfactions?
