Bhagavad Gita 3.38

As fire is shrouded by smoke, a mirror is covered by dust, and a child is enveloped by the womb, so is the universe enveloped in desire.

धूमेनाव्रियते वह्निर्यथाऽऽदर्शो मलेन च।
यथोल्बेनावृतो गर्भस्तथा तेनेदमावृतम्॥

dhūmenāvriyate vahniryathā''darśo malena ca|
yatholbenāvṛto garbhastathā tenedamāvṛtam||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).