Be careful about your physical health also. Satisfy the demands of nature; the car must be given the petrol that it needs. Otherwise, your head might reel and your eyes might get blurred through sheer exhaustion. How can thoughts of the Lord be stabilised in a weak frame? Only, do not forget the purpose of this body when you are tending it. A road roller is fed with oil and coal and other types of fuel. But why is it kept in good trim? In order to mend the road, is it not? Similarly, remember that you have come embodied so that you might realise the end of this cycle of birth and death. For that sake, use the body as an instrument. Flying hither and thither, higher and higher, the bird has, at last, to perch on a tree for rest. So too, even the richest and the most powerful man seeks rest - peace (shanti). - Divine Discourse, Feb 23, 1958.