John Chrysostom — as excerpted in the Catena Aurea on John 3:19-21

“(Hom. xxviii. 3) He does not say this of those who are brought up under the Gospel, but of those who are converted to the true faith from Paganism or Judaism. He shews that no one will leave a false religion for the true faith, till he first resolve to follow a right course of life.”