All healing is of God. There are two classes of causes for illness: (a) Material, and (b) Spiritual. If the sickness is of the body, a material remedy is needed; if of the soul, then a spiritual remedy.
- ‘Abdu’l-Baha (Discourses given by ‘Abdu’l-Baha in London and Paris’; Star of the West, vol. 2, no. 19, March 2, 1912)