We are in one of the universes. And Caitanya Mahaprabhu has described, "As there are many multimillions of mustard seed within a bag." Just imagine. If you bring one bag of mustard seed, round, round, so that round, round seed, that each and every universe. So one devotee of Caitanya Mahaprabhu, Vasudeva Datta, he prayed to Caitanya Mahaprabhu, "Sir, You have come. You deliver all these fallen souls, conditioned souls within the universe. Your kindness can do that. And if You think they are so sinful they cannot be delivered, then I am prepared to take all their sins. I shall remain here alone to suffer. You kindly deliver them." This is Vaisnava desire. Vaisnava is not selfish. He is… Vaisnava's real qualification is para-duhkha-duhkhi: he is unhappy by seeing others unhappy. Personally he has no unhappiness. Why he should be unhappy? He has got Krsna. But as he has become happy by getting Krsna, so he wants others also to become happy, and therefore he tries to spread Krsna consciousness. This is called para-duhkha-duhkhi. He knows that all these conditioned souls, they are, I mean to say, rotting in this material world and suffering. And the only remedy is Krsna consciousness. That's a fact.

From Srila Prabhupada's lecture on Srimad-Bhagavatam 3.26.40 — January 15, 1975, Bombay