He, who knows how to distinguish between true and false, must have an adequate idea of true and false.

When a man is prey to his emotions, he is not his own master.

If slavery, barbarism and desolation are to be called peace, men can have no worse misfortune.

Desire is the essence of a man.

I make this chief distinction between religion and superstition, that the latter is founded on ignorance, the former on knowledge.

Whatever increases, decreases, limits or extends the body's power of action, increases decreases, limits, or extends the mind's power of action. And whatever increases, decreases, limits, or extends the mind's power of action, also increases, decreases, limits, or extends the body's power of action.

Surely human affairs would be far happier if the power in men to be silent were the same as that to speak.