The first requisite for success is the ability to apply your physical and mental energies to one problem incessantly without growing weary.

Courage

Be courageous. I have seen many depressions in business. Always America has emerged from these stronger and more prosperous. Be brave as your fathers before you. Have faith! Go forward!

Failure

Just because something doesn't do what you planned it to do doesn't mean it's useless.

Genius

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

Invention and Inventor

Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.

Maturity

Maturity is often more absurd than youth and very frequently is most unjust to youth.

Opportunity

There is far more opportunity than there is ability.

Perseverance

Many of life's failures are people who did not realize how close they were to success when they gave up.

Progress

Restlessness is discontent and discontent is the first necessity of progress. Show me a thoroughly satisfied man and I will show you a failure.

Scarcity

To my mind the old masters are not art; their value is in their scarcity.

Thoughts and Thinking

It is astonishing what an effort it seems to be for many people to put their brains definitely and systematically to work.

Work

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