In order to get as much fame as one's father one has to much more able than he.

It is not the man who is beside himself, but he who is cool and collected,--who is master of his countenance, of his voice, of his actions, of his gestures, of every part of his play,--who can work upon others at his pleasure.

What has not been examined impartially has not been well examined. Skepticism is therefore the first step towards truth.

This root [the potato], no matter how much you prepare it, is tasteless and floury. It cannot pass for an agreeable food, but it supplies a food sufficiently abundant and sufficiently healthy for men who ask only to sustain themselves. The potato is criticized with reason for being windy, but what matters windiness for the vigorous organisms of peasants and laborers?

We swallow with one gulp the lie that flatters us, and drink drop by drop the truth which is bitter to us.

I picture the vast realm of the sciences as an immense landscape scattered with patches of dark and light. The goal towards which we must work is either to extend the boundaries of the patches of light, or to increase their number. One of these tasks falls to the creative genius; the other requires a sort of sagacity combined with perfectionism.

A thing is not proved because no one has ever questioned it... Skepticism is the first step toward truth.