Front Page Titles (by Subject) Chapter 1: Definition and Use of the Science - The Principles of Moral and Political Philosophy
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Chapter 1: Definition and Use of the Science - William Paley, The Principles of Moral and Political Philosophy 
The Principles of Moral and Political Philosophy, Foreword by D.L. Le Mahieu (Indianapolis: Liberty Fund, 2002).
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Definition and Use of the Science
Moral Philosophy, Morality, Ethics, Casuistry, Natural Law, mean all the same thing; namely, that science which teaches men their duty and the reasons of it.
The use of such a study depends upon this, that, without it, the rules of life, by which men are ordinarily governed, oftentimes mislead them, through a defect either in the rule, or in the application.
These rules are, the Law of Honour, the Law of the Land, and the Scriptures.