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

I'm either going to go completely mental, completely bankrupt, or have the best success of my life.

The first requisite for success is to develop the ability to focus.

I find my greatest pleasure, and so my reward, in the work that precedes what the world calls success.

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

The secret of success is focus of purpose.