Through searching out origins, one becomes a crab. The historian looks backwards, and finally he also believes backwards.

He who laughs best today, will also laughs last.

Something unappeased, unappeasable, is within me.

The finest and healthiest thing about science is, as in the mountains, the brisk air blowing around in it.--The spiritually delicate (such as artists) shun and slander science owing to this air.

Towards gnats and fleas we should show no pity. We would do right to hang petty thieves, petty calumniators, and slanderers.

Annoyance is a physical malady that is in no way cured just because the annoying situation that causes it is eliminated.

Even the bravest only rarely have courage for what they really know.