An expert physician treats his patient with a therapeutic diet. For example, milk preparations sometimes cause disorder of the bowels, but the very same milk converted into curd and mixed with some other remedial ingredients cures such disorders. Similarly, the threefold miseries of material existence cannot be mitigated simply by material activities. Such activities have to be spiritualized, just as by fire iron is made red-hot, and thereby the action of fire begins. Similarly, the material conception of a thing is at once changed as soon as it is put into the service of the Lord. That is the secret of spiritual success.