1899  Man needs his difficulties because they are necessary to enjoy success,

2207  Good friends, good books, and a sleepy conscience: this is the ideal life.

2875  “Friendship is born at that moment when one person says to another: "What! You too? I thought I was the only one.”

1970  An eye for an eye only ends up making the whole world blind.

535  Man needs his difficulties because they are necessary to enjoy success.