All human development, no matter what form it takes, must be outside the rules; otherwise we would never have anything new.

Failures, repeated failures, are sign-posts on the road to achievement. The only time you don't want to fail is the last time you try something (and it works).

Modern psychology teaches that experience is not merely the best teacher, but the only possible teacher.. There is no war between theory and practice. The most valuable experience demands both, and the theory should supplement the practice and not precede it.

I could do nothing without my problems; they toughen my mind. In fact, I tell my assistants not to bring me their successes for they weaken me, but rather to bring me their problems, for they strengthen me.

Believe and act as if it were impossible to fail.

It doesn't matter if you try and try and try again, and fail. It does matter if you try and fail, and fail to try again.

We have been measuring too much in terms of the dollar. What we should do is think in terms of useful materials-things that will be of value to us in our daily life.