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

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

There is no substitute for hard work.

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

Opportunity is missed by most people because it is dressed in overalls and looks like work.

Press on. Nothing in the world can take the place of persistence.

-- Ray Kroc

I had to pick myself up and get on with it, do it all over again, only even better this time.

-- Sam Walton

Rule No. 1: Never lose money. Rule No. 2: Never forget Rule No. 1.

-- Warren Buffett

All the successful entrepreneurs I've met have one thing in common: they all want to talk about their mistakes.

-- Stephen A. Schwarzman

Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.

-- Albert Einstein

A new scientific truth does not triumph by convincing its opponents, but rather because its opponents eventually die and a new generation grows up familiar with it.

-- Max Planck