With a pen in my hand I have successfully stormed bulwarks from which others armed with sword and excommunication have been repulsed.

To make a vow is a greater sin than to break one.

First there is a time when we believe everything, then for a little while we believe with discrimination, then we believe nothing whatever, and then we believe everything again - and, moreover, give reasons why we believe.

One cannot demand of a scholar that he show himself a scholar everywhere in society, but the whole tenor of his behavior must none the less betray the thinker, he must always be instructive, his way of judging a thing must even in the smallest matters be such that people can see what it will amount to when, quietly and self-collected, he puts this power to scholarly use.

People who never have any time on their hands are those who do the least.

Many are less fortunate than you' may not be a roof to live under, but it will serve to retire beneath in the event of a shower.

Prejudices are so to speak the mechanical instincts of men: through their prejudices they do without any effort many things they would find too difficult to think through to the point of resolving to do them.