Subordination to morality can be slavish or vain or self- interested or resigned or gloomily enthusiastic or thoughtless or an act of despair, just as subordination to a prince can be: in itself it is nothing moral.

It is a prejudice to think that morality is more favourable to the development of reason than immorality.

There is a stupid humility that is quite common and when a person is afflicted with it, he is once and for all disqualified for being a disciple of knowledge.

But every soil becomes finally exhausted, and the ploughshare of evil must always come once more.

All credibility, all good conscience, all evidence of truth come only from the senses.

The hour-hand of life.

It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to step into its waters.