"When human brotherhood is founded upon the Holy Spirit, it is eternal, changeless, unlimited."

"It is evident, therefore, that the foundation of real brotherhood, the cause of loving cooperation and reciprocity and the source of real kindness and unselfish devotion is none other than the breaths of the Holy Spirit. Without this influence and animus it is impossible. We may be able to realize some degrees of fraternity through other motives, but these are limited associations and subject to change. When human brotherhood is founded upon the Holy Spirit, it is eternal, changeless, unlimited."

`Abdu'l-Bahá, The Promulgation of Universal Peace, p. 392 

6 November 1912 
(excerpt from) Talk at Universalist Church 
Thirteenth and L Streets, NW, Washington, D.C.