Knowledge (jñāna) is enveloped by this, the constant enemy of the knower, In the form of desire (kāma), O son of Kunti (Kaunteya), and by the insatiable fire.
Knowledge is obscured by the wise man's eternal enemy, which takes form as desire, an insatiable fire, Arjuna.
(39) This is the wise mini's eternal foe; by this is wisdom overcast, whatever form it takes, a fire insatiable.
3.39 O son of Kuntī, Knowledge is covered by this constant enemy of the wise in the form of desire, which is an insatiable fire.
3.39 The knowledge of the intelligent self is enveloped by this constant enemy, O Arjuna, which is of the nature of desire, and which is difficult to gratify and is insatiable.
3.39 O Arjuna, wisdom is enveloped by this constant enemy of the wise in the form of desire, which is unappeasable as fire.