…[The Festival of Ridvan,] the "Most Great
Festival," the "King of Festivals," the "Festival of
God" Himself -- the Festival associated with the accession of Him
[Baha’u’llah] Who is the Lord of the Kingdom to the throne of everlasting
glory, and with the formal assumption by Him of His prophetic office...
- Shoghi
Effendi (From a letter dated June 15, 1946; ‘Messages to America’)