Either one lives for politics or one lives off politics.

One can say that three pre-eminent qualities are decisive for the politician: passion, a feeling of responsibility, and a sense of proportion.

The nation is burdened with the heavy curse on those who come afterwards. The generation before us was inspired by an activism and a naive enthusiasm, which we cannot rekindle, because we confront tasks of a different kind from those which our fathers faced.

Nothing is worthy of man as man unless he can pursue it with passionate devotion.

[In] the realm of science, ... what we have achieved will be obsolete in ten, twenty or fifty years. That is the fate, indeed, that is the very meaning of scientific work. ... Every scientific "fulfillment" raises new "questions" and cries out to be surpassed rendered obsolete. Everyone who wishes to serve science has to resign himself to this.

The fully developed bureaucratic apparatus compares with other organisations exactly as does the machine with the non-mechanical modes of production.

The fate of an epoch that has eaten of the tree of knowledge is that it must...recognize that general views of life and the universe can never be the products of increasing empirical knowledge, and that the highest ideals, which move us most forcefully, are always formed only in the struggle with other ideals which are just as sacred to others as ours are to us.