Love is an ideal thing, marriage a real thing

Everything in the world may be endured except continual prosperity.

As soon as you are in a social setting, you better take away the key to the lock of your heart and pocket it; those who leave thekey in the lock are fools.

What matters in art is not thinking but making.

The people who are absent are the ideal; those who are present seem to be quite commonplace.

If you modestly enjoy your fame you are not unworthy to rank with the holy.

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?