A set of principles may be counterposed to a theory. A ‘principle’ is in one meaning a guide or rule directing one's deliberations or actions. Thus, a person might say ‘It is my principle always to back horses each way’. A principle may also be, however, something more like a foundation of one's personal integrity, as when someone says, ‘It is a principle of mine always to treat my pupils as my equals'. Finally, a principle may constitute a guide to method, as in a celebrated book The Principies of Literary Criticism by I. A. Richards, which sets out what its author argues are the best rules for reading and judging poetry by close analysis of its constituent parts – rhyme, rhythm, language, form, ...