In plain words
The body is made of the five elements; the body must fall one day; the indweller is free of every ill; reckon it: for the indweller there is no birth or death, no marks of the bonds of attachment; see the truth: the indweller is the God of gods….
So in this waning body the Ātma that does not wane shines on without end. "Try to understand that eternal, true principle of prāṇa," he said. This is what Āruṇi taught his son Śvetaketu: "What is eternal, what is true, what is it that, when known, makes one a knower of all, what is it that, when seen, makes you one who has seen all? Recognise that, my son."
So what man must recognise is one thing alone. When we recognise the One, all things merge into it. What is that One? It is the principle of the Ātma. Today we are losing faith in the Ātma. We are learning, not the Ātma, but all the ideas of what is not the Ātma. What are the sādhanas we must do now? Dhyāna? Yoga? Tapas? Japa? Yajña? Yāga? Rituals? It is none of these. One thing alone we must recognise. If we give up the feeling of what is not the Ātma, the vision of the Ātma comes. No sādhanas need be done. These sādhanas are done only for a petty satisfaction of the mind. All these sādhanas we do, we do only through the mind. How can sādhanas done through the mind restrain the mind? Can a thief catch a thief? When he himself is the thief, he will make no attempt at all to catch himself. In just the same way, the mind makes no attempt at all to catch the mind. We must make the mind itself amanaska. What is amanaska? To be free of saṅkalpa is itself amanaska. If we reduce our saṅkalpas little by little, the power of the mind will surely dwindle. So when man wants to develop faith in the Ātma, he must go on dissolving the power of the body, mind and intellect, all of it, in this Ātma itself. Whatever saṅkalpa comes, we must place every one of them in the Ātma. This is true sāyujya.