In plain words
Who mastered the sixty-four branches of learning as few ever could: even that Rāvaṇa gained no unbounded happiness.
In the very end, what came of it all? He could not restrain his senses. Unable to restrain his cravings, he destroyed his whole clan. Unable to kill his desires, he killed his own brothers. Unable to kill his longings, he killed his own sons. In the very end he earned a bad name. He brought Laṅkā to ruin. The very clan of the rākṣasas was destroyed. That one who had studied so many arts should come to this state! That is just why: what did Rāvaṇa say at the very end? ‘Sirs, I learned every art. Every power was in me. I practised tapas, but what use was it? Not even one of them did I put into practice. So, all of you, do not be ruined like me,’ he said. What happiness did I gain? The city of Laṅkā was a heavenly city for every comfort. But I gained no happiness. What was the reason? I was bound by these cravings. I killed my own dear son. We were three brothers. Of us, one was a man of tamoguṇa. I am a man of rajoguṇa. My younger brother Vibhīṣaṇa is sāttvic. These three guṇas are surely present in every human being. These three guṇas spring from man's mind itself. Only the sāttvic Vibhīṣaṇa reached Rāma. The tāmasic Kumbhakarṇa let his life go by unheeded, wholly within food and sleep. This Rāvaṇa, bound up with rajoguṇa, brought ruin on everything. So rajas and tamas must not enter man at all. What must we do so that they do not get in? Rāvaṇa did go on contemplating Īśvara. Mere thinking will not end your troubles. We must put it into practice. God is the dweller in my heart. How could I ever escape the God who is in my heart? Īśvara, who dwells in the heart, does only pure deeds, always. We must put these wicked qualities away.