In plain words
One stone lies below, one lies on top. We pour grain into the middle and keep turning it. Only the upper one turns; the lower one does not turn. It must not turn. In this, man, the one called the jīva, holds on to one part, Dharmavidyā, the gold-winning learning for happiness in this world, and goes round and round, turning the world. In this, in the middle, there is a pivot. That very thing is the goal. Of the grain that falls in there, all of it that is far from that goal, every grain, turns to flour. What lies near the goal stays safe. That is, for one who keeps God as the goal, all is always well, and only well. As for those who let go of God as the goal and go far off, this Prakṛti turns them to flour. So, when we inquire well into the nature of the body, it becomes clear to us that it is only something ever changing, and not something that stands eternal and true. With the body of man there is no high state at all that we attain. We may merely set about using it to some extent, keeping the mind as a tool, through the workings of Buddhi and citta, and nothing more; if the very principle of Buddhi and mind were not there, we could not move about in the world, or stir, at all. Because we keep giving first place to this useless body alone, we are failing to understand our own state, our own course, our own sacredness. Even the skin of a dead animal is of some use, but the body of a dead man is of no use for anything. So the young must recognise this too: to gather so much attachment into this useless body and set about putting far from us what is sacred, what is the goal of our life, can never be the duty of true humanness.
Keep the Vehicle Called the Body in Good Condition
Students! By this I am in no way telling you to put the body wholly away from you, or that you need pay no heed at all to the body's good and ill, its health and strength.