In plain words
Students!
As long as the Buddhi is turned outward, we gain only worldly knowledge; Ātma-jñāna is not acquired. If Ātma-jñāna is wanted, man must turn his thoughts inward. When man pushes outer research aside and strives at inner research, the Ānanda of the Ātma is surely attained. 'Brahmavit brahmaiva bhavati.' He who knows Brahman becomes Brahman itself.
Our body has three kinds of disease, vāta, pitta, śleṣma and the rest. In the very same way Manas too, the subtle body, has three kinds of doṣa. Mala, vikṣepa and āvaraṇa. Mala means this: not to make the fitting effort to recognise who one is, and to believe that one is this body made of the five elements, this body made up of the five sheaths; that belief itself is the doṣa of mala.
Āvaraṇa means that which covers one; that is āvaraṇa. What hides this humanness is attachment and hatred. Besides this, Ahaṅkāra and the sense of mine hide this true svarūpa. Wealth, gold, goods, vehicles and the like too keep making one forget one's svarūpa. All these belong to mala. The six inner enemies all belong to āvaraṇa. This āvaraṇa means that which is covered. With what is it covered? Our true svarūpa is covered by worldly feeling. It is covered also by the guṇas, sattva, rajas and tamas. We have a heart. If we want to see our chest, we must remove completely the clothes we have put on over it. Only then can we see our chest clearly. Inside, he has put on a vest. Over it he has put on a shirt; on top of that he has put on a coat. We must take off the coat; then we must take off the shirt. After that we must take off the vest. This coat on top is the tamoguṇa. The shirt within is the rajoguṇa. The vest inside is the sāttvika. Only when we separate these three can we see our chest. The chest remains the chest, but because of the thing that covers it we are unable to see the chest. This covering itself is āvaraṇa. This we must remove.
Vikṣepa means the nature that has no steadiness. The mind keeps wavering all the time. It keeps entering most of all into worldly things. It is a madness for nothing but these worldly desires. What he has,