It is not enough to have knowledge; one must apply it. It is not enough to have wishes; one must also accomplish it.

It is the great triumph of genius to make the common appear novel.

Hatred is a heavy burden. It sinks the heart deep in the breast, and lies like a tombstone on all joys.

Even though the world as a whole progresses, youth must always start again from the beginning, and as individuals go through the epochs of the world's culture.

Nothing is more damaging to the truth than an old error.

When intelligent and sensible people despise knowledge in their old age, it is only because they have asked too much of it and of themselves.

I hate all bungling as I do sin, but particularly bungling in politics, which leads to the misery and ruin of many thousands and millions of people.