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

My success is due more to my ability to work continuously on one thing without stopping than to any other single quality.

The secret of success is focus of purpose.

The barrier to success is not something which exists in the real world; it is composed purely and simply of doubts about ability.

Focus on your customers and lead your people as though their lives depend on your 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.