Perseverance

Never give up, never, never give up! Because the only person that can stop you is — YOU!

My life needed a challenge, so in 1973, at age 50, I determined to get a Ph.D. They don't call them doctors for nothing. Getting a Ph.D. is painful.

True opportunity never knocks. I have found that I have to go looking for opportunity — and if I don't find it, I have to create it.

Great success is not built on success. It is built on failure, frustration and sometimes even calamity.

You miss 100 percent of the shots you never take.

The important thing in life is to follow your passion — no matter what it is — for whatever mysterious reasons.

When a door is hard to open, and if nothing else works, sometimes you just have to rear back and kick it open.

Idealism is not a paralyzing but a liberating force, and to strive for principles, even if the journey is never completed, is to tap a vast source of energy.

Nothing is really over until the moment you stop trying. Don't give up when you still have something to give.

You can outwork anybody. Try it, you will find out that you can do it. And what a great feeling that is.

When you get knocked down — which is plenty often — you get right up in a hurry, just as quickly as you can.

You can outwork anybody. Try it, and you will find out that you can do it.