The career of a young theoretical physicist consists of treating the harmonic oscillator in ever-increasing levels of abstraction.
— Sidney Coleman
If you want to learn about nature, to appreciate nature, it is necessary to understand the language that she speaks in.
— Richard Feynman
Scientists are not dependent on the ideas of a single man, but on the combined wisdom of thousands of men, all thinking of the same problem, and each doing his little bit to add to the great structure of knowledge which is gradually being erected.
— Ernest Rutherford
Not only is the Universe stranger than we think, it is stranger than we can think.
— Werner Heisenberg
For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.
— Carl Sagan
It is also a good rule not to put overmuch confidence in the observational results that are put forward until they are confirmed by theory.
— Arthur Eddington
Informal black board talk.