1. 1. For a historical introduction, see Stockman, Bahá’í Faith; for its relation to Islam, see Momen, Islam; for its relation to religions, see Momen, Baha’i Faith.
2. 2. A notable exception in this context is the work of Ian Kluge who, in many substantial articles involving comparison of Western philosophers and philosophical movements as well as some Eastern philosophies with the Bahá‘í writings, has promoted a “Bahá‘í philosophy” in the making; see his “Philosophy.”
3. 3. See Bahá‘u’lláh, Tablets no. 10. ‘Abdu’l-Bahá emphasizes the importance of the equal development of the intellectual, spiritual, and material capacities as conditions for the unification of humankind; see Promulgation no. 82.
4. 4. See ’Abdu’l-Bahá, Promulgation no. 105 (’Abdu’l-Bahá referred to this principle in America, but here especially in conjunction with philosophy); ’Abdu’l-Bahá, Paris no. 41; ’Abdu’l-Bahá, Some no. 34.
5. 5. See Faber, God sec. 36. In this function, philosophical theology may be compared with ’Abdu’l-Bahá’s rendering of “Divine Philosophy”; see ’Abdu’l-Bahá, Promulgation no. 96; McLean, “Prolegomena.”