In plain words
When beasts and animals, which have no Vijñāna, prajñāna or sujñāna, give their gratitude in so many ways, if man, who has sujñāna, prajñāna and Vijñāna, cannot give his gratitude in the least, how great a misfortune this is!
To do good in return to one who has done you good is nothing strange, when it is explained; the one who does good to one who has done him harm, without counting his faults, he alone is the skilled one, Sumati!
… . But this is somewhat dangerous. If we do good to one who does harm without the knowledge of discrimination, it turns out to be a great harm. Children who read history know it well. Ghori Muhammad marched against Prithviraj seventeen times. But each time he was defeated, and each time Prithviraj took pity on him and let him go. But no change came about in Ghori Muhammad; later he held out a lure to Jayachandra and, through him, defeated Prithviraj. And at that time Prithviraj fell into Ghori Muhammad's hands. With no gratitude for having been forgiven and set free seventeen times, he gouged out Prithviraj's eyes. So this history tells us that we should not do good to those who do harm. This history shows us that we should not do good to traitors, to those who forget the good done to them. We must try to recognise this principle of life well. We must enter into sacrifice. We must try to help those who are in hardship and in sorrow. We must weigh, with discernment of the permanent and the impermanent, what help to give to which person at what time. When we take up doing good with such a power of enquiry, we do not only help others; we too come to know joy.
Students! We are studying. What kind of learning are we studying? For what purpose are we studying? There are three things above all that students must note. We must not set out to speak of things we do not know. That would be foolishness. To act as if we know, though we do not know: this is dangerous. We must strive to learn it, and when we know it thoroughly, then try to speak of it. To imagine we know before we know is a great mistake. To enter into what we do not know is another great mistake. To learn well what we do not know, and to teach well what we have learnt, is the right path. In today's humanity we act as though we know everything. This itself is Ahaṅkāra. This Ahaṅkāra brings man's downfall.