The most difficult thing is the decision to act, the rest is merely tenacity. The fears are paper tigers. You can do anything you decide to do. You can act to change and control your life; and the procedure, the process is its own reward.
Robyn Davidson

There's no ceiling on effort!
Harvey C. Fruhauf

Determination that just won't quit...that's what it takes.
A. J. Foyt

Attempt the impossible in order to improve your work.
Bette Davis

I have brought myself, by long meditation, to the conviction that a human being with a settled purpose must accomplish it, and that nothing can resist a will which stake even existence upon its fulfillment.
Benjamin Disraeli

No man can fight his way to the top and stay at the top without exercising the fullest measure of grit, courage, determination, resolution. Every man who gets anywhere does so because he has first firmly resolved to progress in the world and then has enough stick-it-tiveness to transform his resolution into reality. Without resolution, no man can win any worthwhile place among his fellow men.
B. C. Forbes

You can do anything if you have enthusiasm. Enthusiasm is the yeast that makes your hopes rise to the stars. With it, there is accomplishment. Without it there are only alibis.
Henry Ford