In plain words
The guru closed his eyes for a while, saw the situation clearly, and then went on explaining the matter to the disciples well and in detail. “My dear ones! The life of this corpse is very strange. As long as he lived, he never listened at all to the words of God or the words of elders. Even when he listened, he did not follow them. That is, he did not put them into practice. Ears that disobeyed God's command. Never once did this man look at what is good. Whenever these eyes looked, it was a gaze darting here and there like a crow's, never a worthy, sacred, divine gaze. And if we look at the hands, they never once took part in good deeds. They were hands that tried to take everyone's property, not hands that put a handful of food in anyone's stomach. And if we look at the feet, they were feet that roamed from bazaar to bazaar like dogs, not feet that travelled to some temple, some satsaṅg, some pilgrimage, some holy place. So we jackals must not touch this impure body, must not eat it. Merely by touching it, this sin would come to us too”: so the big jackal that came taught them, the guru said. Having said this, it took the jackals that were there back with it, so the story goes.
So we must not neglect the body, saying, “When we die, what does it matter to us what becomes of our body?” The body too must find its worth. For this, we must do good deeds today. We must develop a sacred way of seeing. We must surely live by the words we have heard and spoken. We must speak sacred words. We must put all the limbs of our body into worthwhile deeds. If we do not, even jackals will not like this body at all. The human body is most sacred. “Jantūnāṃ narajanma durlabhaṃ”, it is said. Karmānubandini manuṣyaloke! In the human world this body has come to us through karma alone. “Paropakārārtham idaṃ śarīram”: this body has come to us for the sake of helping others. As far as we can, we must put all the limbs of such a body into sacred deeds without fault. But students do not try to understand these words or these matters well. Kṛṣṇa and Arjuna, the two of them, lived together as close companions for eighty-six years. In all those years, at no time and on no occasion did Kṛṣṇa utter anything at all about the Bhagavad Gītā.