Education isn't play--and it can't be made to look like play. It is hard, hard work. But it can be made interesting work.

Because ideas have to be original only with regard to their adaptation to the problem at hand, I am always extremely interested in how others have used used them.

When I have fully decided that a result is worth getting I go ahead of it and make trial after trial until it comes.

I've realized that most of my best ideas have followed a good night's sleep.

Let the public throw bouquets to the inventors and in time we will all be happy.

Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.

There is always a better way.