Religious War has signified the greatest advance of the masses so far, for it proves that the masses have begun to treat concepts with respect.

Great men's errors are to be venerated as more fruitful than little men's truths.

It is certainly not the least charm of a theory that it is refutable; it is precisely thereby that it attracts the more subtle minds. It seems that the hundred-times-refuted theory of the "free will" owes its persistence to this charm alone; some one is always appearing who feels himself strong enough to refute it.

What good is a book that does not even transport us beyond all books?

We do not belong to those who only get their thought from books, or at the prompting of books, -- it is our custom to think in the open air, walking, leaping, climbing, or dancing on lonesome mountains by preference, or close to the sea, where even the paths become thoughtful.

The relatives of a suicide hold it against him that out of consideration for their reputation he did not remain alive.

To do great things is difficult; but to command great things is more difficult.