We still do not know one thousandth of one percent of what nature has revealed to us.

I believe in intuition and inspiration...at times I feel certain I am right while not knowing the reason.

Don't listen to the person who has the answers; listen to the person who has the questions.

Intuitive powers played a central role in my scientific work, not wild speculation, yet a valued resource when no other approach was available.

You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat.

It followed from the special theory of relativity that mass and energy are both but different manifestations of the same thing - a somewhat unfamiliar conception for the average mind. Furthermore, the equation E = mc², in which energy is put equal to mass, multiplied by the square of the velocity of light, showed that very small amounts of mass may be converted into a very large amount of energy and vice versa.

There is, however, one other human right which is infrequently mentioned but which seems to be destined to become very important: this is the right, or the duty, of the individual to abstain from cooperating in activities which he considers wrong or pernicious.