The root of joy, as of duty, is to put all one's powers towards some great end.

Even for practical purposes theory generally turns out the most important thing in the end.

Certitude is not the test of certainty.

Eloquence may set fire to reason.

There is something frightful in the way in which not only characteristic qualities, but particular manifestations of them, are repeated from generation to generation.

Modesty and reverence are no less virtues of freemen than the democratic feeling which will submit neither to arrogance nor to servility.

Research and writing are lonely occupations. It is easy to become discouraged in solitary confinement.