Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.

For every problem, there is one solution which is simple, neat and wrong.

I don't have a solution but I admire the problem.

I don't have any solution, but I certainly admire the problem.

I have yet to see any problem, however complicated, which, when you looked at it in the right way, did not become still more complicated.

The best way to escape from a problem is to solve it.

Unless commitment is made, there are only promises and hopes; but no plans.

When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong.