Peace cannot be achieved through violence. It can only be attained through understanding.
Put your hand on a hot stove for a minute and it seems like an hour. Sit with a pretty girl for an hour and it seems like a minute. THAT'S relativity.
Philosophy is like a mother who gave birth to and endowed all the other sciences. Therefore one should not scorn her in her nakedness and poverty. But should hope, rather, that part of her Don Quixote ideal will live on in her children so that they do not sink into philistinism.
Pure mathematics is, in its way, the poetry of logical ideas.
Possessions, outward success, publicity, luxury - to me these have always been contemptible. I believe that a simple and unassuming manner of life is best for everyone, best both for the body and the mind.
Quantum mechanics is very impressive. But an inner voice tells me that it is not yet the real thing. The theory yields a lot. But it hardly brings us any closer to the secret of the old one. In any case, I am convinced that He doesn't play dice.
Relativity teaches us the connection between the different descriptions of one and the same reality.
Reality is merely an illusion, albeit a very persistent one.