In plain words
You do not know it now, but in the future a life like this will not come again, however much you call it back. To sanctify this time you have, and to keep your qualities pure, you must become people who stand ready to sacrifice even your mind, Buddhi and body for the world and for Bhārata. The body has come for just such a sacred work; but to neglect the body, saying merely, ‘The body was born, the body will go,’ is not right. What is the true sacredness of humanness? You must look after the body. Up to what point? The body must be kept safe until we reach our goal. That much, and no more: to set our attention on the body, forget our goal and waste our life is not right.
The Sacred Body Has Come to Discharge the Four Debts
Whether you do good or do evil, in the end you cannot escape giving up the body. Whosever it may be, the body in this world is surely impermanent. But as long as we are here, we must win for this body a lasting fame that befits it. Rather than roam about forever as a crow, roam for a moment as a swan. We should live five minutes with good fame. There is no use living fifty years in ill fame: so Prahlāda said.
If he will not worship Śiva till his hands are content, if he will not speak the praise of Hari till his mouth aches, if he will not hold compassion, Satya and the like in his thoughts, why is he born at all, a ruin to his mother's womb!
So a son born from such a mother's womb must show some measure of gratitude, to give that mother's womb contentment. Our debts are four: the debt to the mother, the debt to the father, the debt to the gods, the debt to the ṛṣis. This sacred body has come to discharge these four debts. The mother, with so much hardship, pours out her blood, her food, her all, for her son.