Solicitude for the body to the extent of learning how to care properly for it, how to keep it in good health, how to keep up its strength, will only help and not obstruct solicitude for the soul. The person whose body is breaking down, whose organs are unable to work properly, whose vitality is poor, is likely to become more worried and preoccupied about his body than the person who is free from these troubles. How can he forget the flesh under such conditions? He will be miserably conscious of it far too often. Lofty advice which pays no heed to it and tells him nothing about how to deal with it may sound elevating to his ear but will not be alleviating to his problem. Any teaching which ignores the body, which leaves it an ever-present worry, must inevitably be a one-sided, incomplete one. Such indifference to the body's welfare cannot be the teaching of true wisdom and therefore cannot be defended.
-- Perspectives > Chapter 5: The Body > # 4