For believe me! - the secret for harvesting from existence the greatest fruitfulness and the greatest enjoyment is: to live dangerously! Build your cities on the slopes of Vesuvius! Send your ships into uncharted seas! Live at war with your peers and yourselves! Be robbers and conquerors as long as you cannot be rulers and possessors, you seekers of knowledge! Soon the age will be past when you could be content to live hidden in forests like shy deer! At long last the search for knowledge will reach out for its due: - it will want to rule and possess, and you with it!

There is something laughable about the sight of authors who enjoy the rustling folds of long and involved sentences: they are trying to cover up their feet.

Everything good, fine or great they do is first of all an argument against the skeptic inside them.

What is the seal of liberation? - No longer being ashamed in front of oneself.

Two things can get people to make efforts: if people want to get something, or if they want to get rid of something. Only, in ordinary conditions, without know…

An ignorant doctor is the aide-de-camp of death.

What we ask of him is, that he should find out for us more than we can find out for ourselves.... He must have the passion of a lover.