SOCRATES: He will say of himself, and others will say of him, that he is dying with these delights; and the more dissipated and good-for-nothing he is, the more vehemently he pursues them in every way; of all pleasures he declares them to be the greatest; and he reckons him who lives in the most constant enjoyment of them to be the happiest of mankind.
PROTARCHUS: That, Socrates, is a very true description of the opinions of the majority about pleasures.
SOCRATES: Yes, Protarchus, quite true of the mixed pleasures, which arise out of the communion of external and internal sensations in the body; there are also cases in which the mind contributes an opposite element to the body, whether of pleasure or pain, and the two unite and form one mixture. Concerning these I have already remarked, that when a man is empty he desires to be full, and has pleasure in hope and pain in vacuity. But now I must further add what I omitted before, that in all these and similar emotions in which body and mind are opposed (and they are innumerable), pleasure and pain coalesce in one.
PROTARCHUS: I believe that to be quite true.
SOCRATES: There still remains one other sort of admixture of pleasures and pains.
PROTARCHUS: What is that?
SOCRATES: The union which, as we were saying, the mind often experiences of purely mental feelings.
PROTARCHUS: What do you mean?
SOCRATES: Why, do we not speak of anger, fear, desire, sorrow, love, emulation, envy, and the like, as pains which belong to the soul only?
PROTARCHUS: Yes.