Alan Ryan

Joseph Butler

Peter Carl Mentzel

Francisco Suárez

Immanuel Kant

Michael Polanyi

René Descartes

Andrea Branchi

Ralph C. Hancock

Eric Mack

Lao Tzu

Bas van der Vossen

Michael Huemer

Carlo Lottieri

Roderick T. Long

Francis Edward Sparshott

Michael Silverthorne

Aaron Garrett

Eric Schliesser

Evelyn Shirley Shuckburgh

Michael J. Seidler

Aeon J. Skoble

Avicenna

Mo Tzu

William Godwin

Panaetius

Alexander the Great

Blaise Pascal

Gershom Carmichael

Marcus Aurelius Antoninus

David Conway

Paul Carus

Helmut Schoeck