Samuel Clemens AKA Mark Twain

Common sense: the ability to look at the earth and see that it is obviously flat.

Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did. So throw off the bowlines, sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream.

Keep away from people who try to belittle your ambitions. Small people always do that but the really great make you feel that you, too, can become great.

The man who does not read good books has no advantage over the man who cannot read them.

The difference between the almost-right word and the right word is...the difference between the lightening bug and the lightening.