He alone is free who lives with free consent under the entire guidance of reason.

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

. . . to know the order of nature, and regard the universe as orderly is the highest function of the mind.

One and the same thing can at the same time be good, bad, and indifferent, e.g., music is good to the melancholy, bad to those who mourn, and neither good nor bad to the deaf.

It is usually the case with most men that their nature is so constituted that they pity those who fare badly and envy those who fare well.

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

Emotion, which is suffering, ceases to be suffering as soon as we form a clear and precise picture of it.