In plain words
Only when we grow Prema for God do all these go far from us, easily. Clouds move about in the sky. Sit and watch for a while! After a while all those clouds break up and go. Our heart is the sky. Our thoughts are the clouds. Our Buddhi is the sun. Our mind is the moon. When these clouds come thick, darkness covers everything for a while. But if you stay calm for a while, all this darkness passes. Our thoughts themselves are the clouds. To lessen these thoughts is Vairāgya. When thoughts lessen, desires lessen automatically. So we must grow the divine principle and cut down the principle of Prakṛti. In these Navarātri days, everyone is able to reach this through the sādhana of Devī pūjā. All our desires are mixed with some good and some bad. Some are very harsh too. This is what is called the nature of the rākṣasa. Today there are three kinds of state in man. One, humanness; two, beasthood; three, demonhood. There are three kinds: the man among men, the demon among men, the beast among men. Within a single man all three are present, and beyond them there is also a divinity that transcends them. To follow the body is beasthood. To follow only the mind is demonhood. To follow only the Ātma is divinity. To follow Ātma, Manas and body is humanness. To follow all three, Ātma, Manas and body, is humanness. To follow nothing but the body is beasthood. We see this in daily life. The body has its needs: hunger, thirst. One's Manas and one's power of discrimination all follow only the body: that is beasthood. Then, to follow only the mind is demonhood. When such a one wants to do anything, he gives no thought at all to Vijñāna, Prajñāna or Sujñāna. Following the mind, he keeps falling into folly.
Rāvaṇa had learnt many branches of learning. He had great discernment and power of discrimination.