You can never solve a problem on the level on which it was created.

Albert Einstein

A life spent making mistakes is not only more honorable but more useful than a life spent in doing nothing.

George Bernard Shaw

I have not failed. I've just found 10,000 ways that won't work.

Thomas Alva Edison

The price of greatness is responsibility.

Winston Churchill

Far and away the best prize that life offers is the chance to work hard at work worth doing.

Theodore Roosevelt