- 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.
- Clouds and the Hiding God: Observations on some Terms in the Early Writing of Bahá'u'lláh, by Moshe Sharon (2012). Metaphorical usage of clouds and rain in the mystical Tablets Rashh-i-Amá, Lawh Kullu't-Ta'ám, and Qasídiyyih-Varqá'iyyih.
- Garden of the Heart, The, by Abdu'l-Bahá, Bahá'u'lláh Frances Esty, comp. (1930). Early thematic compilation from the Bahá'í Writings.
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