The greatest height of heroism to which an individual, like a people, can attain is to know how to face ridicule.

All knowledge has an ultimate goal. Knowledge for the sake of knowledge is, say what you will, nothing but a dismal begging of the question.

Man is perishing. That may be, and if it is nothingness that awaits us let us so act that it will be an unjust fate.

The skeptic does not mean him who doubts, but him who investigates or researches, as opposed to him who asserts and thinks that he has found.

To love with the spirit is to pity, and he who pities most loves most.

Anyone who in discussion relies upon authority uses, not his understanding, but rather his memory.

Everything that exalts and expands consciousness is good, while that which depresses and diminishes it is evil.