1938 - Ringstone Inscription Explained
"The inscription upon the Bahá'í ringstone is the symbol of the Greatest Name, Baha who is the Manifestation of the essence of God. It is also symbolic of the three planes representing the World of God, the World of Revelation and the World of Creation."
(From a letter written on behalf of Shoghi Effendi to and individual believer, February 28, 1938) 270
(Compilations, Lights of Guidance, p. 269)