Wisdom is not the product of schooling, but of the lifelong attempt to acquire it.

Strength does not come from physical capacity. It comes from an indomitable will.

Empty pockets never held anyone back. Only empty heads and empty hearts can do that.

It has seemed to be more necessary to have regard to the weight of words rather than to their number.

To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact

The only limit to our realization of tomorrow will be our doubts of today.

Thought can be so seductive and hypnotic that it absorbs your attention totally, so you become your thoughts.

Courage is resistance to fear, mastery of fear - not absence of fear.

Criticize the act, not the person.

Science has not yet taught us if madness is or is not the sublimity of the intelligence.

Mistakes are always forgivable, if one has the courage to admit them.

Good means not merely not to do wrong, but rather not to desire to do wrong.

Don't compromise yourself. You are all you've got.

One of the truest tests of integrity is its blunt refusal to be compromised.

It is a cliche that most cliches are true, but then like most cliches, that cliche is untrue.

An intelligent hell would be better than a stupid paradise.

I am a lover of truth, a worshipper of freedom, a celebrant at the altar of language and purity and tolerance.

The pendulum of the mind oscillates between sense and nonsense, not between right and wrong.

Those who dance are considered insane by those who cannot hear the music.

If we do not lay out ourselves in the service of mankind whom should we serve?

Taste every fruit of every tree in the garden at least once. It is an insult to creation not to experience it fully. Temperance is wickedness.