In plain words
So God has another name, Nāra. This air and water, the support of life, are vital. They are the form of the Ātma, the very wealth of our life. Though this principle of God is everywhere, people cannot recognise it. Aṇor aṇīyān mahato mahīyān. God dwells in the body as the Ātma. The form called the Ātma is not only in the body; it is everywhere as well. Antar bahiś ca tata sarvavyāpya nārāyaṇa sthitaḥ: within, without and everywhere is this principle of God.
To recognise such a principle of Prema is man's chief duty. Man has two chief limbs. One is the head; the second is the heart. This head keeps craving only what is outside. It keeps craving only the objects, the persons and the things that are passing, physical and worldly. So, in sum, we can say that this head has the nature of pravṛtti. It is from pravṛtti that all these intentions arise. From the heart, on the other hand, rise the qualities of nivṛtti: Satya, Prema, compassion, forbearance, sympathy and the like. So man, by setting his sight on the heart, is transformed into a pure being. That is why Vedānta teaches you to cultivate the inward sight. That is pravṛtti. This is nivṛtti. But the principle of nivṛtti makes no sense at all to pravṛtti. Man holds the joys that are outward, momentary and worldly, the joys he has in this body, to be what matters most, and toils in many ways for them. To such people the principle of the heart makes no sense at all. They do not experience it in the right way. Though the heart is in the body itself, the body cannot recognise the principle of the heart. How so?
Does the tree itself know the sweet juice in its fruit? Do the creepers enjoy the nectar in the flower? Does the book enjoy the sweet savour in the poems? How can a scholar of pravṛtti know the essence of nivṛtti?
The fruit is in the tree itself. The sweet juice is in the fruit itself, but the tree does not enjoy that juice in the least. Our body is a tree. The heart in it is a fruit. The sweet Prema in this heart is the juice in it. The tree called the body does not recognise this juice at all. It does not enjoy it. It does not delight in it. It does not understand it. That is why man falls prey to so many sorrows, disappointments and despairs.