Doctors are always working to preserve our health and cooks to destroy it, but the latter are the more often successful.

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No man has received from nature the right to command his fellow human beings.

Disturbances in society are never more fearful than when those who are stirring up the trouble can use the pretext of religion to mask their true designs.

What has not been examined impartially has not been well examined. Skepticism is therefore the first step toward truth.

When superstition is allowed to perform the task of old age in dulling the human temperament, we can say goodbye to all excellence in poetry, in painting, and in music.

Virtue is praised but hated. People run away from it for it is ice-cold and in this world you must keep your feet warm.

Only a very bad theologian would confuse the certainty that follows revelation with the truths that are revealed. They are entirely different things.

The best mannered people make the most absurd lovers.

There are things I can't force. I must adjust. There are times when the greatest change needed is a change of my viewpoint.

Sentences are like sharp nails, which force truth upon our memories.

Skepticism is the first step on the road to philosophy.

All abstract sciences are nothing but the study of relations between signs.

Although a man may wear fine clothing, if he lives peacefully; and is good, self-possessed, has faith and is pure; and if he does not hurt any living being, he is a holy man.

Only passions, great passions can elevate the soul to great things.

The general interest of the masses might take the place of the insight of genius if it were allowed freedom of action.