One thing and only one thing will unfailingly and alone
secure the undoubted triumph of this sacred Cause, namely the extent to which
our own inner life and private character mirror forth in their manifold aspects
the splendour of those eternal principles proclaimed by Bahá'u'lláh.
- Shoghi
Effendi (From a letter dated 24 September 1924 to the Bahá'ís of America,
published in Bahá'í Administration: Selected Messages, 1922-1932)