Man is nature's sole mistake.

Take my counsel, happy man; / Act upon it, if you can!

I'm a greenery-yallery, Grosvenor Gallery, / Foot-in-the-grave young man!

No man is a failure who enjoys life

Be cautious, but not too cautious; do not be too much afraid of making a mistake; a man who never makes a mistake will make nothing.

In the U.S. you have to be a deviant or exist in dreary boredom. Make no mistake; all intellectuals are deviants in the U.S.