The only excuse for making a useless thing is that one admires it intensely. All art is quite useless.
To know anything about oneself one must know all about others.
I always pass on good advice. It is the only thing to do with it. It is never of any use to oneself.
Never buy a thing you don't want merely because it is dear.
An idea that isn't risky is hardly worth calling an idea.
Morality is simply the attitude we adopt towards people whom we personally dislike.