We must be skeptical even of our skepticism.
The rules of logic are to mathematics what those of structure are to architecture.
no one ever gossips about the virtues of others
To think I have spent my life on absolute muck.
We have in fact, two kinds of morality, side by side: one which we preach, but do not practice, and another which we practice, but seldom preach.
Any pleasure that does no harm to other people is to be valued.