Ruhi Book 8 - The Covenant of Bahá'u'lláh (Persian)

The Lesser Covenant is the major theme explored in The Covenant of Bahá'u'lláh. The capacities built include the ability to remain firm in, and to defend the Lesser Covenant.
الواح وصاياى مبارکهٔ حضرت عبدالبهاء
الواح وصاياى مبارکهٔ حضرت عبدالبهاء