September 25

As material and physical sciences are taught here and are constantly unfolding in wider vistas of attainment, I am hopeful that spiritual development may also follow and keep pace with these outer advantages. As material knowledge is illuminating those within the walls of this great temple of learning, so also may the light of the spirit, the inner and divine light of the real philosophy glorify this institution. The most important principle of divine philosophy is the oneness of the world of humanity, the unity of mankind, the bond conjoining East and West, the tie of love which blends human hearts. 
- ‘Abdu’l-Baha  (From a talk at Columbia University, New York, 19 April 1912; ‘The Promulgation of Universal Peace: Talks Delivered by 'Abdu'l-Bahá during His Visit to the United States and Canada in 1912’)