What are some of your favorite philosophical sayings?

Question

What are your favorite philosophical saying and/or quotes?

Answer 1

You can pick your friends.

You can pick your nose.

But, you can't pick your friend's nose.

Answer 2

A man with one watch knows what time it is; a man with two watches is never quite sure.  ~Lee Segall

Alice came to a fork in the road.  "Which road do I take?" she asked.

"Where do you want to go?" responded the Cheshire cat.

"I don't know," Alice answered.

"Then," said the cat, "it doesn't matter."

~Lewis Carroll, Alice in Wonderland

You never know what is enough, until you know what is more than enough.  ~William Blake, Proverbs of h**l