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

As a cure for worrying, work is better than whisky.

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.

Focus and simplicity...once you get there, you can move mountains.

The most important single thing is to focus obsessively on the customer. Our goal is to be earth's most customer-centric company.