With reference to your question concerning spiritual healing: Its importance, as you surely know, has been greatly emphasized by 'Abdu'l-Bahá, Who considered it, indeed, as an essential part of physical processes of healing. Physical healing cannot be complete and lasting unless it is reinforced by spiritual healing. And this last one can be best obtained through obedience to the laws and commandments of God as revealed to us through His Manifestations. Individual believers, however, can also help by imparting healing to others. But the success of their efforts depends entirely on their strict adherence to the Teachings, and also on the manner in which they impart them to others. According to Bahá'u'lláh man cannot obtain full guidance directly from God. He must rather seek it through His Prophets. Provided this principle is clearly understood and explained, the Guardian sees no harm that the friends should try to effect spiritual healing in others. Any such cure effected, however, should be done in the name of Bahá'u'lláh and in accordance with His teachings. For God, and God alone, is the Supreme and Almighty Physician, and all else are but instruments in His hands.
- Shoghi Effendi (From a letter written on behalf of Shoghi Effendi, 23 May 1935 to an individual believer; The Compilation of Compilations, vol. I, Some Aspects of Heath, Healing, Nutrition and Related Matters)
