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

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

The secret of success is focus of purpose.

Success is based on imagination plus ambition and the will to work.

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

If you worry about yesterday's failures, then today's successes will be few. The future depends on what we do in the present.