…difference and variety is inherent and innate in the parts
and members of man, which afford the means for revealing perfections, and since
these members and parts (of the human organism) are under the control of the
king of the spirit, the spirit interpenetrates the parts and governs even the
veins and arteries. This difference and variety then is no barrier to oneness
and love governed by the spirit. This diversity is indeed the greatest power of
unity.
- ‘Abdu’l-Baha (From a Tablet; Star of the West, vol. 6, no. 9, August
20, 1915)