Jelal-ud-Din Rumi; in his Masnavi, speaks of fire, air, water, earth, and ether as beings, while man calls them things. To man they are things, to God they are beings, obedient servants. Whatever He wishes, they do. As the servant acts according to his master's desires, so these elements act as God desires. Further, not only does the will of God work through elements, but the will of man also, in proportion to the power of his will. A loaf of bread given with will-power can cure a man's disease more successfully than a medicine, if there is enough will-power with it. The lesson of Christ, that if one has faith even as a grain of mustard one can remove mountains, can be understood after one has realized that it is the will-power which does the work.