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.

The present is theirs the future, for which I really worked, is mine.

If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found the object of his search... I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety per cent of his labor.