Freedom of speech and freedom of action are meaningless without freedom to think. And there is no freedom of thought without doubt.

The civilized man has a moral obligation to be skeptical. . . . Any man who for one moment abandons or suspends the questioning spirit has for that moment betrayed humanity.

Words are one of our chief means of adjusting to all the situations of life. The better control we have over words, the more successful our adjustment is likely to be.

An honorable man will not be bullied by a hypothesis.

Most civilized lives are measured out with coffee spoons.

The civilized man has a moral obligation to be skeptical, to demand the credentials of all statements that claim to be facts.

Lying is an indispensable part of making life tolerable.