‘Abdu’l-Bahá said: Disease is of two kinds: material and spiritual.

Take for instance, a cut hand; if you pray for the cut to be healed and do not stop its bleeding, you will not do much good; a material remedy is needed.

Sometimes if the nervous system is paralyzed through fear, a spiritual remedy is necessary. Madness, incurable otherwise, can be cured through prayer. It often happens that sorrow makes one ill, this can be cured by spiritual means.