Physics is essentially an intuitive and concrete science. Mathematics is only a means for expressing the laws that govern phenomena.
Albert EinsteinI have never looked upon ease and happiness as ends in themselves. This ethical basis I call the ideal of the pigsty.
Albert EinsteinWe can invent as many theories we like, and any one of them can be made to fit the facts. But that theory is always preferred which makes the fewest number of assumptions.
Albert Einstein