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Definition of Theory

Theory

  1. A doctrine, or scheme of things, which terminates in speculation or contemplation, without a view to practice; hypothesis; speculation.
  2. An exposition of the general or abstract principles of any science; as, the theory of music.
  3. The science, as distinguished from the art; as, the theory and practice of medicine.
  4. The philosophical explanation of phenomena, either physical or moral; as, Lavoisier's theory of combustion; Adam Smith's theory of moral sentiments.

Theory Quotations

My theory on life is that life is beautiful. Life doesn't change. You have a day, and a night, and a month, and a year. We people change - we can be miserable or we can be happy. It's what you make of your life.
Mohammed bin Rashid Al Maktoum

If you want to know the taste of a pear, you must change the pear by eating it yourself. If you want to know the theory and methods of revolution, you must take part in revolution. All genuine knowledge originates in direct experience.
Mao Zedong

The things that will destroy America are prosperity-at-any-price, peace-at-any-price, safety-first instead of duty-first, the love of soft living, and the get-rich-quick theory of life.
Theodore Roosevelt

Scientific views end in awe and mystery, lost at the edge in uncertainty, but they appear to be so deep and so impressive that the theory that it is all arranged as a stage for God to watch man's struggle for good and evil seems inadequate.
Richard P. Feynman

There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another theory which states that this has already happened.
Douglas Adams
More "Theory" Quotations

Theory Translations

theory in Dutch is theorie
theory in German is Theorie
theory in Italian is gamma
theory in Portuguese is teoria
theory in Swedish is teori
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