“The scientific theorist is not to be envied. For Nature, or more precisely experiment, is an inexorable and not very friendly judge of his work. It never says ‘Yes’ to a theory. In the most favorable cases it says ‘Maybe,’ and in the great majority of cases simply ‘No.’ If an experiment agrees with a theory it means for the latter ‘Maybe,’ and if it does not agree it means ‘No.’ Probably every theory will someday experience its ‘No’—most theories, soon after conception.”
- Albert Einstein
