[[John of the Cross|St. John of the Cross]] wrote a treatise on spiritual purification of the soul by God, which has become a classic of Christian spirituality and has been regarded as a profoundly insightful treatment of the [[psychology]] of the effects of sincere Christian dedication to God. Students of alchemy regard it, and other Christian writings treating of [[Mysticism|mystical theology]], as alchemical texts. | [[John of the Cross|St. John of the Cross]] wrote a treatise on spiritual purification of the soul by God, which has become a classic of Christian spirituality and has been regarded as a profoundly insightful treatment of the [[psychology]] of the effects of sincere Christian dedication to God. Students of alchemy regard it, and other Christian writings treating of [[Mysticism|mystical theology]], as alchemical texts. |