Barnabas:
“The whole past time of your faith will profit you nothing, unless now in this wicked time we also withstand coming sources of danger.”
Origen:
“He who has not denied himself, but denied Christ, will experience the saying ‘I also will deny him.’”
Justin Martyr:
“And let those who are not found living as He taught, be understood to be no Christians, even though they profess with the lip the precepts of Christ; for not those who make profession, but those who do the works, shall be saved, according to His word: ‘Not everyone who says to me, “Lord, Lord,” will enter the kingdom of heaven, but the one who does the will of my Father who is in heaven’ [Matt. 7:21].”