A man who has not enough originality to think out a new title for his book will be much less capable of giving it new contents.

Reading is equivalent to thinking with someone else's head instead of with one's own.

This is the case with many learned persons; they have read themselves stupid.

No one writes anything worth writing, unless he writes entirely for the sake of his subject.

Noise is the most impertinent of all forms of interruption. It is not only an interruption, but also a disruption of thought.

Boredom is just the reverse side of fascination.

We will gradually become indifferent to what goes on in the minds of other people when we acquire a knowledge of the superficial nature of their thoughts, the narrowness of their views and of the number of their errors. Whoever attaches a lot of value to the opinions of others pays them too much honor.