Nothing thicker than a knife's blade separates happiness from melancholy.

Melancholy is the pleasure of being sad
The sad dislike those who are cheerful, and the cheerful dislike the melancholy
Great men are always of a nature originally melancholy


On Anger: "For every minute you remain angry, you give up sixty seconds of peace of mind."
On Destiny: "Our destiny exercises its influence over us even when, as yet, we have not learned its nature: it is our future that lays down the law of our today."
Human, All Too Human
On Friendship: "A crowd is not company; and faces are but a gallery of pictures; and talk but a tinkling cymbal, where there is no love."