John Chrysostom — as excerpted in the Catena Aurea on Luke 12:8-12

“There are other modes also of denying which St. Paul describes, saying, They profess that they know God, but in works they deny him. (Tit. 1:16.) And again, If any provide not for his own, and specially for those of his own house, he hath denied the faith, and is worse than an infidel. (1 Tim. 5:8.) Also, Flee from covetousness, which is idolatry. (Col. 3:5.) Since then there are so many modes of denial, it is plain that there are many likewise of confession, which whosoever has practised, shall hear that most blessed voice with which Christ greets all who have confessed Him. But mark the precaution of the words. For in the Greek he says, Whosoever shall confess in Me, shewing that not by his own strength, but by the aid of grace from above, a man confesses Christ. But of him who denies, He said not “in Me,” but me. For though being destitute of grace he denies, he is nevertheless condemned, because the destitution is owing to him who is forsaken, or he is forsaken for his own fault.”