He who has art and science also has religion, but those who do not have them better have religion.

The greatest happiness for the thinking person is to have explored the explorable and to venerate in equanimity that which cannotbe explored.

Piety is not a goal but a means to attain through the purest peace of mind the highest culture.

I am a part of the part that at first was all, part of the darkness that gave birth to the light, that supercilious light which now disputes with Mother Night her ancient rank and space, and yet cannot succeed; no matter how it struggles, it sticks to matter and can't get free. Light flows from substance, makes it beautiful.

All ages have said and repeated that one should strive to know one's self. This is a strange demand which no one up to now has measured up to and, strictly considered, no one should. With all their study and effort, people are directed to what is outside, to the world about them, and they are kept busy coming to know this and to master it to the extent that their purposes require. . . . How can you come to know yourself? Never by thinking, always by doing. Try to do your duty, and you'll know right away what you amount to. And what is your duty? Whatever the day calls for.

Should I not be proud, when for twenty years I have had to admit to myself that the great Newton and all the mathematicians and noble calculators along with him were involved in a decisive error with respect to the doctrine of color, and that I among millions was the only one who knew what was right in this great subject of nature?

If a man knows where to get good advice, it is as though he could supply it himself.