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Luigi Turco is Professor of Philosophy at the University of Bologna.
Peter Paul Seaton Jr.
David Conway
Titus Lucretius Carus
Samuel Gregg
Aeon J. Skoble
Jack Russell Weinstein
Thomas Reid
Jean-Jacques Rousseau
David W. Carrithers
Saint Augustine
John Passmore
Joseph Butler
Plotinus
James Mill
Thales
Elaine Sternberg
Jennifer A. Frey
Anthony Ashley Cooper, Earl of Shaftesbury
Charlotte C. Thomas
Daniel L. Dreisbach
Carlo Lottieri
Francis Hutcheson
James Beattie
Jan Narveson
Virginia Postrel
Immanuel Kant
Nicholas Capaldi
Alexander the Great
Ayn Rand
Benedict de Spinoza
Henry B. Veatch
Michael Silverthorne