My deep religiosity [...] found an abrupt ending at the age of twelve, through the reading of popular scientific books.

All meaningful and lasting change starts first in your imagination and then works its way out. Imagination is more important than knowledge.

How insidious Nature is when one is trying to get at it experimentally.

Science is the century-old endeavor to bring together by means of systematic thought the perceptible phenomena of this world into as thorough-going an association as possible.

It is humankind's duty to respect all life, not only animals have feelings but even also trees and plants.

The conflict that exists today is no more than an old-style struggle for power, once again presented to mankind in semireligious trappings. The difference is that, this time, the development of atomic power has imbued the struggle with a ghostly character; for both parties know and admit that, should the quarrel deteriorate into actual war, mankind is doomed.

The most important tool of the theoretical physicist is his wastebasket.