With hearts overflowing with the love of God, with tongues commemorating the mention of God, with eyes turned to the Kingdom of God, they must deliver the Glad Tidings of the manifestation of the Lord of Hosts to all the people. Know ye of a certainty that whatever gathering ye enter, the waves of the Holy Spirit are surging over it, and the heavenly grace of the Blessed Beauty encompasseth that gathering. (‘Abdu’l-Baha, ‘Tablets of the Divine Plan’; The Compilation of Compilations, vol. II, Guidelines for Teaching)