I used to feel unsafe right in the moment of an accomplishment - I felt the ground fall from under my feet because this could be the end. And even now, while everyone is celebrating, I'm on to the next thing. I don't want to get lost in this big cushion of success.

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

Failure comes from ego, greed, envy, fear, imitation. I have success not because I am smart, but because I am rational.

The key to success is emotional stability.

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

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