In plain words
There is a balloon. When you fill that balloon with air, it gradually grows bigger. As it grows bigger yet, bigger and bigger, and becomes greater still, it bursts its very form and joins the air, its own all-pervading nature. In the same way, though the all-pervading form of the Ātma is everywhere, as we go on increasing our faith, little by little, within the balloon called our heart, it too breaks the knot of the heart and merges in the all-pervading Ātma. That very thing can be called merging, the goal, dissolution. If there is no air of faith inside the balloon called our heart, it just stiffens up like cardboard. However long it is left, it can never again burst and join the all-pervading air. So it is only by making the fitting effort to strengthen our faith in the Ātma, the very thing we call self confidence, that sense control too is won through it, and that we come to experience sacred Divinity within the principle of our life. The other five senses in our body, too, are bound to the single sense of the tongue. Once you have restrained the tongue alone, that is, once you see to it that there is no eating too much, no talking too much, no putting needless words into it, there is room for not only your health but your Ānanda too to grow. That is exactly why Śaṅkara gave this tongue a fine lesson.
O tongue, knower of tastes, lover of sweetness, Satya and the good for you, the highest, I declare: recite the sweet syllables ‘Govinda, Dāmodara, Mādhava’.
‘O tongue that knows taste! O tongue that speaks Satya! O sacred tongue! O tongue, lord of all the senses! I am teaching you a word for your good. Guard your purity with it,’ he said. And what is that good word? ‘Make the words “Govindā, Dāmodarā, Mādhavā” dance upon your tongue,’ he taught.