Without a family, man, alone in the world, trembles with the cold.

A friend loves you for your intelligence, a mistress for your charm, but your family's love is unreasoning; you were born into it and are of its flesh and blood. Nevertheless it can irritate you more than any group of people in the world.

Happiness is never there to stay [...] Happiness is merely a respite offered by inquietude.

The effectiveness of work increases according to geometric progression if there are no interruptions.

The difficult part in an argument is not to defend one's opinion but rather to know it.

All of us, from time to time, need a plunge into freedom and novelty, after which routine and discipline will seem delightful by contrast.

Our minds have unbelievable power over our bodies.