- Answered Questions, Some, by Abdu'l-Bahá (2014). 'Table talks' given by ‘Abdu’l‑Bahá in ‘Akká between 1904 and 1906 in response to questions posed by Laura Dreyfus-Barney; first published in 1908, the new 2014 edition has been extensively retranslated.
- Bahá'u'lláh's Teachings on Spiritual Reality, Paul Lample, comp. (1996). The quest for spirituality, the spiritual life, material and spiritual reality, the progress of the soul and humanity’s spiritual education.
- Immortality and the Human Soul: Lecture Series, by Hooper Dunbar (1989/1990).
- Interview Between a Prominent Rabbi and 'Abdu'l-Bahá (1912-06-24). Interview in New York, c. April 1912, emphasizing true religion and prophetic influence over tradition, imitation, and doctrinal distractions across major faiths.
- Seven Mysteries of Life, The: An Exploration in Science and Philosophy, by Guy Murchie (1979). Chapter 23 of this wide-ranging book, "The Seventh and Ultimate Mystery: Divinity," discusses Bahá'í teachings; non-random universe; origins of spirit; spiritual evolution; mysticism and logic; progressive revelation; relativity of God; soul education.
- Tablet addressed to the Bahá'ís of Mosul, by Abdu'l-Bahá (2007). Emphasizes universal interdependence, cooperation, and generosity, linking these principles to spiritual and social progress, particularly through the institution of Huqúqu’lláh.
- Tablet to Auguste Forel, by Abdu'l-Bahá, Shoghi Effendi, trans. (1976). A letter of ʻAbdu'l-Bahá written in 1921, in reply to questions asked by the Swiss scientist Auguste-Henri Forel, exploring the soul, mind, spirit, and God's existence, affirming spiritual reality beyond materialism.
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