Cyril of Jerusalem

Such is Paul's account. And we have reached the "falling away." Men, that is, have fallen away from the true faith. Some proclaim the identity of Father and Son. Others dare to assert that one should believe Christ has come into existence out of nonexistence. Formerly heretics were quite evident, but now the church is full of masked heretics. For men have deserted the truth and want to have their ears tickled. Make a plausible case, and everyone is ready to listen to you. Talk of changing one's life, and everyone deserts you. The majority have fallen away from the sound doctrines and are readier to choose what is bad than to prefer what is good. So there you have the "falling away," and the coming of the enemy is to be expected next. Meanwhile, he has begun to send out his forerunners here and there, so that the spoil may be prepared for him when he comes. Therefore, brothers, look to yourselves. Watch over your souls carefully.