Knowledge is covered by this eternal enemy of the wise, oh son of Kuntī, which has the form of desire and is insatiable fire.

Desire as veil of knowledge. Āvṛtam — covered, veiled — describes jñāna obscured not destroyed.

Nitya-vairiṇā — eternal enemy — because it arises from psychic life itself. Kāma-rūpeṇa — in the form of desire — and duṣpūreṇa analena — insatiable fire — indicate that it is never satisfied. Each satisfaction generates new desire; the fire grows with each offering.