In plain words
It is most necessary that you, young women, grasp its inner meaning.
A lamp not only drives away darkness; its flames also travel upward. Wherever you set a lamp, its flames travel upward. They have taught its inner meaning: going upward is Jñāna, the divinity that journeys towards God. Ūrdhvagati, the upward course, is the path that travels to the higher place. Another meaning of it is that adhogati, the downward course, sets out towards sin and is the root cause of ignorance. Only when we clearly see these two special qualities of the lamp is there a chance for us to understand its special worth as well. Not only this: to light a lamp, four things must be there, the clay lamp, oil, wick and matchbox. The lamp drives away only the darkness outside; it cannot drive away the darkness within. To light the light within, four things are essential. Vairāgya is the clay lamp. Bhakti is the oil. Control of the senses is the main wick. Tattva-jñāna is the matchbox. Without these four things the lamp cannot burn. Without the clay lamp, or without oil, it cannot be lit. Without a wick there is no way at all. Without a matchbox, even when the other three are there they are of no use. These four are bound inseparably, each resting on the others. Only when we make each the support of the other does this light of the Ātma shine in us. Unable to recognise the divinity in himself, he tries to know everything in the world. This itself is foolishness.
When rust has set in, it can be scoured off; the husk can be separated from the seed; ignorance, if you want, can be driven away; but there is no setting a fool right.
There is no way at all to drive away this foolishness. From time without beginning, foolishness has set hard in us. In every matter, self-interest and one's own gain. Without these two, man cannot take a single step forward. Whatever he does, whatever he thinks, whatever he sees, says or hears, self-interest is always stirring behind it. Is this self-interest, this gain for oneself, the goal of life? No. No. We must recognise that man's life is the truth of these two: the good of others, and purity. This lamp that drives off the darkness outside, this lamp that dispels ignorance, cannot look into the inner principle at all.
Hanumān went to Laṅkā and, in his anger at Rāvaṇa, set fire to Laṅkā.