Thus, I blush to add, you can not be a philosopher and a good man, though you may be a philosopher and a great one.

Poverty does not produce unhappiness: It produces degradation.

Fashions are the only induced epidemics, proving that epidemics can be induced by tradesmen.

New opinions often appear first as jokes and fancies, then as blasphemies and treason, then as questions open to discussion, and finally as established truths.

Better never than late.

When the world goes mad, one must accept madness as sanity; since sanity is, in the last analysis, nothing but the madness on which the whole world happens to agree.

The liar's punishment is not in the least that he is not believed, but that he cannot believe anyone else.