John Adams,
F. H. Bradley,
Wilhelm Dilthey,
Martin Heidegger,
William James,
Joseph Joubert,
Immanuel Kant,
Maimonides,
Gabriel Marcel,
Michel de Montaigne,
Boris Pasternak,
Fernando Pessoa,
Robert M. Pirsig,
John Polkinghorne,
John Ray,
William Winwood Reade,
Della Reese,
Erwin Schrodinger,
Swami Sivananda,
Huston Smith,
Wallace Stevens,
Voltaire,
Walt Whitman,