Almost all of our sorrows spring out of our relations with other people. There is no more mistaken path to happiness than worldliness.

Happiness consists in frequent repetition of pleasure

The two foes of human happiness are pain and boredom

What disturbs and depresses young people is the hunt for happiness on the firm assumption that it must be met with in life. From this arises constantly deluded hope and so also dissatisfaction. Deceptive images of a vague happiness hover before us in our dreams, and we search in vain for their original. Much would have been gained if, through timely advice and instruction, young people could have had eradicated from their minds the erroneous notion that the world has a great deal to offer them.

The two enemies of human happiness are pain and boredom.

The greatest of follies is to sacrifice health for any other kind of happiness.