...Thy letter was received. There is no time to answer them in detail…. Firmness in The Covenant means obedience so that no one may say, 'this is my opinion' nay rather he must obey...
SW.Star of the West, 25 vols. (1910-1935). Periodical issued each Bahá’í month. Vols. 1-12 reprinted 1978 in 8 volumes by George Ronald. Each issue Includes a section in Persian. https://bahai.works/Star_of_the_West