Essay Concerning Human Under-standing , see (

http://www.oreganstate.edu/instruct/phl302/texts/locke/locke1/Essay_contents.html ) (accessed 31 January 2011).

Anthony Ashley-Cooper, Earl of Shaftesbury,

Characteristiks of Men, Manners, Opinions, Times (1737), vol. 2, sec 1. (

http://www.oll.libertyfund.org/index ) (accessed 31 January 2011).

Joseph Butler’s celebrated 'cool hour’ occurs in Sermon 11,

Fifteen Sermons Preached at the Rolls Chapel , ed. W. R. Matthews (London, 1953).

Immanuel Kant,

The Metaphysics of Morals , ed. Mary Gregor (Cambridge Texts in the History of Philosophy, 1996).

Adam Smith,

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