I owe my success to the fact that I never had a clock in my workroom.

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

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

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

The secret to success is to make your vocation your vacation.

The secret of success is focus of purpose.