Learning is the only thing the mind never exhausts, never fears, and never regrets.

Those who condemn the supreme certainty of mathematics feed on confusion, and can never silence the contradictions of the sophistical sciences which lead to eternal quackery.

Perspective is a most subtle discovery in mathematical studies, for by means of lines it causes to appear distant that which is near, and large that which is small.

I abhor the supreme folly of those who blame the disciples of nature in defiance of those masters who were themselves her pupils

We are deceived by promises and time disappoints us.

I am never weary of being useful... In serving others I cannot do enough. No labor is sufficient to tire me.

simplicity is the best sophistication