38 – 39 – 40 - 41. Even as the fire covered by smoke, even as the mirror by dust, even as embryo by the womb, even so is this (Self) covered by that (Desire). Enveloped is the wisdom of the wise by this eternal adversary, in the form of insatiable desire, O son of Kunti. The senses, the mind and the intelligence are said to be its seat. By enveloping the wisdom, these are said to delude the Jiva. Therefore, restraining these senses from the beginning, O Arjuna, slay this evil destroyer of wisdom and knowledge.
Bhashya :- How is that an adversary? It is adversary concealed like fire is enveloped by smoke, even though the self is luminous is not perceivable; even so the Supreme Self. Even as the mirror enveloped by dust is not perceivable by one desiring to be seen, even so the inner consciousness being enveloped by desire, the Supreme Self is not perceivable. Just as the embryo is not visible being enveloped by the womb, even so is Jiva enveloped by desire. One knows from scriptures that wisdom is not luminous, without realizing first the Supreme Self. When such is the case of the men of wisdom, what to speak of the men of little understanding ? कामरूपेण means in the form of desire. Desires comes to be fulfilled with great pain. Even if the position of Indra and others is not easily attained because of the insatiable desire even the the position of Brahman is attempted, not being easily satisfied- Even as evil desires are like smoke to the fire, even so they are for realizing Brahman. Even as dust is to the mirror, even so it inaccessible to the inner consciousness. Even as the womb covers the embryo, even so is the Jiva bound. The enemy, senses etc. are identified here for destroying them. The intelligence being enveloped by the senses etc. the wisdom becomes obscured. When seat itself is destroyed, would the enemy not be destroyed?