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 failed my way to success.

Success is the result of hard work.

Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.