UtshovBhagavad Gita 3.38
धूमेनाव्रियते वह्निर्यथाऽऽदर्शो मलेन च।
यथोल्बेनावृतो गर्भस्तथा तेनेदमावृतम्।।3.38।।
Dhumenavriyate vahniryathadarsho malena cha
Yatholbenavrito garbhastatha tenedamavritam
Simple meaning, written by AIAs fire is covered by smoke, a mirror by dust, and an embryo by its membrane, so this knowledge is covered by that desire.