The consideration of pleasure and pain also falls within the scope of the political philosopher, since he has to construct the end by reference to which we call everything good or bad.
Moreover, this is one of the subjects we are bound to discuss; for we said that moral virtue and vice have to do with pleasures and pains, and most people say that happiness implies pleasure, which is the reason of the name μακάριος , blessed, from χαίρειν , to rejoice.
Now, (1) some people think that no pleasure is good, either essentially or accidentally, for they say that good and pleasure are two distinct things; (2) others think that though some pleasures are good most are bad; (3) others, again, think that even though all pleasures be good, yet it is impossible that the supreme good can be pleasure.