Srila Prabhupada

Now these same two brothers have again descended, as Śrī Kṛṣṇa Caitanya-Nityānanda. Sahoditau: simultaneously They have appeared. Not that one is appeared, another is not there. No. Both of Them, sahoditau. And They are compared with the sun and moon. The business of sun and moon is to dissipate darkness. The sun rises during daytime, and the moon rises at night. But this sun and moon, wonderful sun and moon, citrau, They have appeared together. But the business is the same, tamo-nudau. Business is to dissipate darkness, because we are in darkness. We, anyone who is in this material world, he's in darkness. Darkness means ignorant, no knowledge. They are mostly animals. "Why they are animals, so civilized men, so well dressed and university education degrees? Why they are in darkness?" Yes, they are in darkness. "What is the proof?" The proof is that they are not Kṛṣṇa conscious. This is the proof.
(750326 - Lecture CC Adi 01.02 - Mayapur)