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Semple was an advocate and translator of Kant.
Dugald Stewart
Francis Hutcheson
Blaise Pascal
Matt Zwolinski
Tibor R. Machan
Ayn Rand
Hardy Bouillon
William Godwin
Bas van der Vossen
Eric Mack
Joseph Butler
Gershom Carmichael
Virginia Postrel
Peter Carl Mentzel
Lao Tzu
James Beattie
Brian Kogelmann
Jeremy Bentham
William George Pogson Smith
Michael Silverthorne
Mary Campbell Smith
Benjamin Hoffmann
Michael J. Seidler
Saint Augustine
Douglas Den Uyl
St. Thomas Aquinas
Adam Smith
Alexander Broadie
Jean-Jacques Rousseau
Titus Lucretius Carus
Socrates
Andrea Branchi