The present is theirs; the future, for which I really worked, is mine.
The day science begins to study non-physical phenomena, it will make more progress in one decade than in all the previous centuries of its existence.
The scientists of today think deeply instead of clearly. One must be sane to think clearly, but one can think deeply and be quite insane.
Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more.
I do not think you can name many great inventions that have been made by married men.
The spread of civilisation may be likened to a fire; first, a feeble spark, next a flickering flame, then a mighty blaze, ever increasing in speed and power.