| Never express yourself more clearly than you are able to think. |
| The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth. |
| Prediction is very difficult, especially about the future. |
| Your theory is crazy, but it's not crazy enough to be true. |
| An expert is a person who has made all the mistakes that can be made in a very narrow field. |
