[I]n the future life a Christian will not be tested as to whether he renounced the world, whether he fasted, whether he performed vigils, whether he prayed, whether he wept, or performed any such good deeds in the present life; but he will be carefully tested as to whether he has some kind of likeness to Christ, as a son to his father, as the Apostle Paul also says: My little children, over whom I am again in travail until Christ be formed in you (Gal. 4:19). For as many of you have been baptized into Christ have put on Christ (Gal. 3:27).
Those who keep the gates of the Kingdom of Heaven, if they do not see in a Christian the likeness of Christ, as a son to his father, will by no means open to him and allow him to enter. (Homily 2.3-4 The Blessed State)