imputation; for if the sources of pleasure were precisely the same to human beings and to swine, the - John Stuart Mill

If there are any persons who contest a received opinion,
or who will do so if law or opinion will let them, let us thank
them for it, open our minds to listen to them, and rejoice
that there is some one to do for us what we otherwise ought,
if we have any regard for either the certainty or the vitality of
our convictions, to do with much greater labor for ourselves.

It is better to be a human being dissatisfied than a pig satisfied; better to be Socrates dissatisfied than a fool satisfied. And if the fool, or the pig, is of a different opinion, it is only because they only know their own side of the question.

I have learned to seek my happiness by limiting my desires, rather than in attempting to satisfy them.