Our ignorance of Reality renders us blind to the truth and deaf to God's voice. Our hearts are heavy with pain and suffering. Hence, salvation may be regarded as healing the soul of its infirmity and restoring it to health where it can realize its true potential. Religious teaching may be regarded as a sovereign remedy, and the founder who bears the truth may be likened to a master physician. But there is also a causal, psychosomatic relationship between healing of the soul and health of the body.
Physical health is thus a welcome by-product of spiritual health.
There has come to you an exhortation from your Lord, a balm for that which is in the breasts, a guidance and mercy for believers. Gracious to us be the Lord of the world. Qur'an 26.77-80, p. 137. For waters shall break forth in the wilderness, and streams in the desert. Judaism and Christianity.