I have spoken to Einstein and he admitted to me that his theory was in fact no different from the one of Parmenides.

The attempt to make heaven on earth invariably produces hell.

No number of sightings of white swans can prove the theory that all swans are white. The sighting of just one black one may disprove it.

The initial stage, the act of conceiving or inventing a theory, seems to me neither to call for logical analysis nor to be susceptible of it.

The method of science depends on our attempts to describe the world with simple theories: theories that are complex may become untestable, even if they happen to be true. Science may be described as the art of systematic over-simplification-the art of discerning what we may with advantage omit.

The history of science, like the history of all human ideas, is a history of irresponsible dreams, of obstinacy, and of error.

Historically speaking all - or very nearly all - scientific theories originate from myths.