A man does not die of love or his liver or even of old age; he dies of being a man.

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.

The tears of anguish irritate and excite; but those of repentance are the ones that wash.

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

Chemistry ought to be not for chemists alone.

True science teaches, above all, to doubt and be ignorant.

Dream abides; it is the only things that abides; vision abides.