Everything in nature is a cause from which there flows some effect.

I do not know how to teach philosophy without becoming a disturber of established religion.

I saw that all things I feared, and which feared me, had nothing good or bad in them save insofar as the mind was affected by them.

The safest way for a state is to lay down the rule that religion is comprised solely in the exercise of charity and justice, and that the rights of rulers in sacred, no less than in secular matters, should merely have to do with actions, but that every man should think what he likes and say what he thinks.

Man can, indeed, act contrarily to the decrees of God, as far as they have been written like laws in the minds of ourselves or the prophets, but against that eternal decree of God, which is written in universal nature, and has regard to the course of nature as a whole, he can do nothing.

He who seeks equality between unequals seeks an absurdity.

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