- Universal House of Justice. Meditation, Prayer, and Spiritualization (1983-09-01). — Practicing personal spirituality and methods for achieving spiritual growth.
- Universal House of Justice. Spiritual Growth, Essential Requisites for (1983-09-01). — Letter to Europe, its historically-recent turn away from religion, six ways to improve spirituality,...
- National Spiritual Assembly of the Bahá'ís of Ireland, Adib Taherzadeh. Spiritualization of the Bahá'í Community: A Plan for Teaching (1982). — A three-part collection consisting of a letter from the NSA of Ireland, a letter from Taherzadeh to ...
- Bahá'u'lláh. Shoghi Effendi, trans. "Tablet of the True Seeker" from the Kitáb-i-Íqán (Book of Certitude), The (1931). — Guidance to the true seeker, a passage from the Kitab-i-Íqan (Book of Certitude).
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