Rudolf Otto
Muhammad Iqbal
Edwin Hatch
T. Troward
Orson F. Whitney
Kaiten Nukariya
W. S. Bell
Jean-Marie Guyau
Baron d'Holbach
David Marshall Brooks
Benedetto Croce
Friedrich Schiller
George John Romanes
H. A. Prichard
W. R. Sorley
Lorenz Oken
Paul Carus
John Dewey
John Alexander Gunn
De Witt H. Parker
George Santayana
William De Witt Hyde
