The two enemies of human happiness are pain and boredom.

The two foes of human happiness are pain and boredom

Life swings like a pendulum backward and forward between pain and boredom.

Life swings like a pendulum backward and forward between pain and boredom

Money is human happiness in the abstract; he, then, who is no longer capable of enjoying human happiness in the concrete devotes himself utterly to money.

The deep pain that is felt at the death of every friendly soul arise from the feeling that there is in every individual something which is inexpressible, peculiar to him alone, and is, therefore, absolutely and irretrievably lost