Solutions to tough problems should be made as simple as possible - and no simpler.

Since I have introduced this term I had always a bad conscience. . . . I cannot help to feel it strongly and I am unable to believe that such an ugly thing should be realized in nature.

If I had an hour to solve a problem I'd spend 55 minutes thinking about the problem and 5 minutes thinking about solutions.

When you trip over love, it is easy to get up. But when you fall in love, it is impossible to stand again.

This has been done elegantly by Minkowski; but chalk is cheaper than grey matter, and we will do it as it comes.

Necessity is the mother of all invention.

Our task must be to free ourselves by widening our circle of compassion to embrace all living creatures and the whole of nature and its beauty.