Sometimes a foolish question arises: "If everyone becomes devout, how will this world continue?" That's your concern. If everyone becomes honest, how will prison work? What does prison serve then? If it closes, that's something good. Similarly, if everyone becomes devout and the material world business closes forever, that's something very good. But that's not going to happen. It's not possible. (Prabhupada, Śrīmad-Bhāgavatam 6.3.27-28, Gorakhpur, February 20, 1971)