Scientific knowledge is the highest attainment upon the human plane, for science is the discoverer of realities. It is of two kinds: material and spiritual. Material science is the investigation of natural phenomena; divine science is the discovery and realization of spiritual verities. The world of humanity must acquire both. A bird has two wings; it cannot fly with one. Material and spiritual science are the two wings of human uplift and attainment. Both are necessary—one the natural, the other supernatural; one material, the other divine.1

  1. ʻAbduʼl-Bahá. The Promulgation of Universal Peace: Talks Delivered by ʻAbduʼl-Bahá during His Visit to the United States and Canada in 1912. Edited by Howard MacNutt. 2nd ed. Wilmette, Ill: Baháʼí Publishing Trust, 1982, pp. 195-196. [return]