Bhakti is the one essential thing.
To be sure, God exists in all beings.
Who, then is a devotee? He whose mind dwells on God.
But this is not possible as long as one has egotism and vanity.
The water of God's grace cannot collect
on the high mound of egotism. It runs down.
We laugh at the efforts of the musk deer to find the source of the scent which comes from itself and despair at our efforts to find the peace which is our essence.
You speak of doing good to the world. Is the world such a small thing? And who are you, pray, to do good to the world? First realise God, see Him by means of spiritual discipline. If He imparts power you can do good to others; otherwise not.
All will surely realize God. All will be liberated. It may be that some get their meal in the morning, some at noon, and some in the evening; but none will go without food. All, without any exception, will certainly know their real Self.
So long as one does not become simple like a child, one does not get divine illumination. Forget all the worldly knowledge that thou hast acquired and become as a child, and then will thou get the divine wisdom.
Men are like pillow-cases. The colour of one may be red, that of another blue, and that of the third black; but all contain the same cotton within. So it is with man; one is beautiful, another is ugly, a third holy, and a fourth wicked; but the Divine Being dwells in them all.