Philebus

SOCRATES: He knows that any want of measure and symmetry in any mixture whatever must always of necessity be fatal, both to the elements and to the mixture, which is then not a mixture, but only a confused medley which brings confusion on the possessor of it.

SOCRATES: Then, if we are not able to hunt the good with one idea only, with three we may catch our prey; Beauty, Symmetry, Truth are the three, and these taken together we may regard as the single cause of the mixture, and the mixture as being good by reason of the infusion of them.

PROTARCHUS: There is no need to pause, for the difference between them is palpable; pleasure is the veriest impostor in the world; and it is said that in the pleasures of love, which appear to be the greatest, perjury is excused by the gods; for pleasures, like children, have not the least particle of reason in them; whereas mind is either the same as truth, or the most like truth, and the truest.

PROTARCHUS: But when we see some one indulging in pleasures, perhaps in the greatest of pleasures, the ridiculous or disgraceful nature of the action makes us ashamed; and so we put them out of sight, and consign them to darkness, under the idea that they ought not to meet the eye of day.

SOCRATES: Then, Protarchus, you will proclaim everywhere, by word of mouth to this company, and by messengers bearing the tidings far and wide, that pleasure is not the first of possessions, nor yet the second, but that in measure, and the mean, and the suitable, and the like, the eternal nature has been found.

SOCRATES: And would you not put in the fourth class the goods which we were affirming to appertain specially to the soul—sciences and arts and true opinions as we called them? These come after the third class, and form the fourth, as they are certainly more akin to good than pleasure is.