June 24. On this date in 1911, 'Abdu'l-Bahá stated "The foundation of the spiritual meetings must be the teaching and delivering of the Cause of God. In these meetings the believers and maid-servants of the Merciful must proclaim the proofs and arguments and explain the signs of the appearance of the Beauty of Abhá...But the fundamental principle of the establishment of spiritual meetings is for the sake of teaching and delivering the Truth so that those souls who are present may become informed of the Divine Evidences and Proofs."

June 24. On this date in 1911, 'Abdu'l-Bahá stated "The foundation of the spiritual meetings must be the teaching and delivering of the Cause of God. In these meetings the believers and maid-servants of the Merciful must proclaim the proofs and arguments and explain the signs of the appearance of the Beauty of Abhá...But the fundamental principle of the establishment of spiritual meetings is for the sake of teaching and delivering the Truth so that those souls who are present may become informed of the Divine Evidences and Proofs."

25. You have written concerning the spiritual meetings. The foundation of the spiritual meetings must be the teaching and delivering of the Cause of God. In these meetings the believers and maid-servants of the Merciful must proclaim the proofs and arguments and explain the signs of the appearance of the Beauty of Abhá - May my life be a sacrifice to the beloved ones! Meanwhile they may read some Tablets and Communes, and at the end of the meetings, if they desire to sing with the utmost supplication and meekness, it is acceptable. But the fundamental principle of the establishment of spiritual meetings is for the sake of teaching and delivering the Truth so that those souls who are present may become informed of the Divine Evidences and Proofs.
(“Star of the West”, vol. 2, no. 6 (24 June 1911), p. 5)