In plain words
The body is made of the five elements; the body must fall, there is no escaping it; the dweller in the body is free of every ill; consider it: for the dweller there are no deaths and births, no marks of the fetters that delusion binds; see the truth: that dweller is the God of gods, if you ponder it in your mind, He whose form is the Ātma.
So truly, one's own Ātma itself offers men every kind of way and fills them with Ānanda. The Ātma gives nothing but Ānanda, without end; sorrow and grief are not in it at all. Pāyasam poured into a vessel: however many holes you bore in this vessel, from whichever hole it comes, what comes is pāyasam, and not some other, bitter thing. The Ātma is full of Ānanda. That is why all the ṛṣis gave this Ātma the name Ānanda. This is what Ānanda means: Ānanda of this kind.
the Ānanda of Brahman, giver of the highest joy, absolute, Jñāna in form, beyond the pairs of opposites, like the sky, the goal that 'Tat tvam asi' and the rest point to, one, eternal, spotless, unmoving, witness of every mind, beyond all feeling, free of the three guṇas.
These are the true marks of the svarūpa of the Ātma, of the svabhāva of the Ātma. Such Ānanda never brings sorrows or hardships, pains or griefs. When such a treasure is right beside you, why do you strive so hard for this world that brings sorrows, griefs and hardships?
Students! In the world, people make certain kinds of safeguards for a store of wealth. Now there are banks. In a bank there is all the money one wants. But no one just leaves that money and goes away. They take every precaution it needs. They shut it up in iron safes. They fasten great big locks on it all. Night and day the guards protect it. If we want to get the money inside, we must break down this door. We must smash the lock. We must strike the watchman there and overpower them in every way. Only then does the money fall into our hands. In just the same way, a kind of security has been set up around this treasure called Ānanda. What is it that guards it? The serpent called Ahaṅkāra moves about everywhere. It keeps circling without rest.