A research problem is not solved by apparatus; it is solved in a man's head.

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.

Don't bring anything to me but trouble.

I think that the greatest education in the world is the education which helps one to be able to do the right things at the time it has to be done.

Keep on going and the chances are you will stumble on something, perhaps when you are least expecting it. I have never heard of anyone stumbling on something sitting down.

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.

The price of progress is trouble.