- Paul Lample, comp. Bahá'u'lláh's Teachings on Spiritual Reality (1996). The quest for spirituality, the spiritual life, material and spiritual reality, the progress of the soul and humanity’s spiritual education.
- Anjam Khursheed. Body, Mind, Soul and Spirit (1998). The Bahá'í view of human nature involves an interaction between spirit, soul and body — these three elements exist both in the Semitic religions and in the Far Eastern ones; Western dualist and Eastern monist traditions are in fact all tripartite.
- Bahá'u'lláh. Tablet of the Manifestation (Lawh-i-Zuhur) (1998).
- Abdu'l-Bahá. Shoghi Effendi, trans. Tablet to Auguste Forel (1976). A letter of ʻAbdu'l-Bahá, in reply to questions asked by the Swiss scientist Auguste-Henri Forel, dated 21 September 1921.
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