December 23

Concerning the Greatest Name; this term refers both to “Alláh-u-Abhá” and to “Yá Bahá’u’l-Abhá”. The first is a form of Bahá’í greeting and should be used, while the other is an invocation, meaning “O Thou Glory of Glories!” These two words are both referred to as the Greatest Name. 
- Shoghi Effendi  (From a message dated 23 September, 1935, written on behalf of Shoghi Effendi; ‘Messages to Australia and New Zealand’)