No fairer destiny could be allotted to any physical theory than that it should of itself point out the way to the introduction of a more comprehensive theory, in which it lives on as a limiting case.
Albert EinsteinA man has to work so hard so that something of his personality stays alive. A tomcat has it so easy, he has only to spray and his presence is there for years on rainy days.
Albert EinsteinOne should not pursue goals that are easily achieved. One must develop an instinct for what one can just barely achieve through oneโs greatest efforts.
Albert Einstein