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

There is no substitute for hard work.

Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.

Genius is one percent inspiration and ninety-nine percent perspiration.

I never did anything by accident, nor did any of my inventions come by accident; they came by work.

When I served Xiang Yu, my rank never exceeded that of a palace guard, and my position was no more than a halberd-bearer. My words went unheeded, my plans unused -- and so I left Chu for Han.

-- Han Xin

After victory, tighten the cords of your helmet.

-- Kuroda Yoshitaka

I serve.

-- Edward, the Black Prince

One chance is all you need.

-- Jesse Owens

Land is the Mother and Labour the Father of Wealth.

-- William Petty

When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us.

-- Alexander Graham Bell