An unsophisticated forecaster uses statistics as a drunken man uses lamp-posts - for support rather than for illumination.
If you see an antimatter version of yourself running towards you, think twice before embracing.
A theory is the more impressive the greater the simplicity of its premises, the more different kinds of things it relates, and the more extended its area of applicability. Therefore the deep impression that classical thermodynamics made upon me. It is the only physical theory of universal content which I am convinced will never be overthrown, within the framework of applicability of its basic concepts.
Research is to see what everybody else has seen, and to think what nobody else has thought.
We have the only cookbook in the world that has partial differential equations in it.
There cannot be a language more universal and more simple, more free from errors and obscurities…more worthy to express the invariable relations of all natural things [than mathematics]. [It interprets] all phenomena by the same language, as if to attest the unity and simplicity of the plan of the universe, and to make still more evident that unchangeable order which presides over all natural causes.