In plain words
As soon as a man is first born, he knows only his own hunger, his own sleep, his own pain. Everyone knows this. The newborn child knows nothing at all but its own sleep, its own hunger and its own pain. When it is hungry, it cries. When it has drunk milk, it sleeps. Growing and growing, it forms a bond with its mother. From itself it reaches out as far as the mother. Then, growing and growing, it spreads Prema from the mother onto these three: elder sister, elder brother and father. Growing and growing a little more, it spreads this Prema over its companions and friends. Then, when it has grown up fully, there is a marriage. After this marriage, this Prema spreads over the family too. With their brothers-in-law and further all such people too, he makes his Prema grow. After that, sons worthy of him are born to him. After those sons are married, Prema keeps growing over the new families. In this way, how wide Prema keeps growing, though it began with self alone! In this way He granted us family life so that we might make Prema grow, not so that we should lie in it like a frog in a well, with selfish ends and our own gain alone. So was man's life granted.
As this Prema grows, the heart grows very broad. That Prema makes the heart broad. Prema refines our saṃskāras. Prema enters into Satya. Prema shows sympathy. Seeing the pain of others, he too feels pain. To make the heart broad in this way, they have given us this embodiment of power called Bhakti. That is why Bhakti is like the chief life-breath in humanness.
Bhakti alone gives the supreme goal; Bhakti alone destroys the disease of worldly life; Bhakti alone grants the supreme knowing; Bhakti alone grants supreme Mokṣa.
Bhakti bestows Jñāna, the supreme goal. What destroys the disease of worldly life is Bhakti itself. Bhakti itself gives the holy supreme principle. It is Bhakti, this very Bhakti, that destroys delusion and brings Mokṣa, which is the presence of God. Only through such holy Bhakti must we try to reach God. A small example. When we keep a parrot in a cage, or put a tiger in a pen, and look at it every day, not much joy arises in us. When we set that very tiger free in its natural forest and it roams there naturally, walking its majestic walk, joy bursts out in us.