May 6

If the health and well-being of the body be expended in the path of the Kingdom, this is very acceptable and praiseworthy; and if it be expended to the benefit of the human world in general — even though it be to their material benefit — and be a means of doing good, that is also acceptable. But if the health and welfare of man be spent in sensual desires, in a life on the animal plane, and in devilish pursuits — then disease were better than such health; nay, death itself were preferable to such a life. If thou art desirous of health, wish thou health for serving the Kingdom. I hope that thou mayest attain perfect insight, inflexible resolution, complete health, and spiritual and physical strength in order that thou mayest drink from the fountain of eternal life and be assisted by the spirit of divine confirmation. 
- 'Abdu'l-Bahá  (cited in "Bahá'u'lláh and the New Era"; The Compilation of Compilations, vol. I, Some Aspects of Heath, Healing, Nutrition and Related Matters)