Physical concepts are free creations of the human mind, and are not, however it may seem, uniquely determined by the external world.
Albert EinsteinThe formulation of the problem is often more essential than its solution, which may be merely a matter of mathematical or experimental skill.
Albert EinsteinThe 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.
Albert Einstein