No burden is so heavy for a man to bear as a succession of happy days.

Every advance in knowledge brings us face to face with the mystery of our own being.

A new truth always has to conend with many difficulties. If it were not so, it would have been discovered much sooner.

An experiment is a question which science poses to Nature and a measurement is the recording of Nature's answer.

Science cannot solve the ultimate mystery of nature. And that is because, in the last analysis, we ourselves are a part of the mystery that we are trying to solve.

There is a real world independent of our senses; the laws of nature were not invented by man, but forced on him by the natural world. They are the expression of a natural world order.

No burden is so heavy for a man to bear as a succession of happy days.