Man has two
powers; and his development, two aspects. One power is connected with the
material world, and by it he is capable of material advancement. The other
power is spiritual, and through its development his inner, potential nature is
awakened. These powers are like two wings. Both must be developed, for flight
is impossible with one wing.
- ‘Abdu’l-Baha (From a talk, 25 April, 1912, Washington, D.C.; ‘The Promulgation of Universal
Peace: Talks Delivered by 'Abdu'l-Bahá during His Visit to the United States
and Canada in 1912’)
