Finally, in some areas at least, Nature seems to show an inexplicable simplicity. This is a brute fact, more or less of a bonus, which if it had not existed could not have been expected. As a result, the working scientist learns as a matter of routine experience that he should have faith that the more beautiful and more simple of two equally (inaccurate) theories will end up being a more accurate describer of wider experience.
This bit of luck vouchsafed the theorist should not be pushed too far, for the gods punish the greedy.
- Paul Samuelson (Theory and Realism: A Reply)