Compassion for the friend should conceal itself under a hard shell.

How much truth can a spirit bear, how much truth can a spirit dare? ... that became for me more and more the real measure of value.

All truly great thoughts are conceived by walking.

One is fruitful only at the cost of being rich in contradictions.

It is certain that the Jew, if he desired-or if they were driven to it, as the antisemites seem to wish-could now have the ascendancy, nay, literally the supremacy, over Europe; that they are not working or planning for that end is equally sure... The resourcefulness of the modern Jews, both in mind and soul, is extraordinary.

No one can draw more out of things, books included, than he already knows. A man has no ears for that to which experience has given him no access.

You implanted your highest goal into the heart of those passions: then they became your virtues and joys.