Hendrik Willem van Loon
Eduard Zeller
Paul Eltzbacher
Georg Brandes
Max Stirner (tr. Steven T. Byington)
William Hogarth
Gotthold Ephraim Lessing
Seneca (tr. John Clarke)
Mary Parker Follett
Gorham B. Munson
Albert G. Mackey
Porphyry (tr. Thomas Taylor)
Johann Joachim Winckelmann
Auguste Comte
A. H. Noe
Rudolf Steiner
Avicenna (Ibn Sina)
M. Schele de Vere
J. B. Bury
Claude Bragdon
W. B. Yeats
Michael Sendivogius & Paracelsus
Muhammad Iqbal
