John Chrysostom

"For none of us liveth unto himself, and no man dieth unto himself. For whether we live, we live unto the Lord; and whether we die, we die unto the Lord," by this too he makes the same clearer. For how can he that liveth unto the Law, be living unto Christ? But this is not the only thing that he effects by this, he also holds back the person who was in so much haste for their being set right, and persuades him to be patient, by showing that it is impossible for God to despise them, but that in due time He will set them right. …

Homily on Romans 25 ↗

Theophylact of Ohrid

We have, he says, a Lord Who cares for us and Who considers our life a gain and our death a loss. For we live or die not for ourselves alone, but also for the Lord. By life he means here the life in faith, and by death the falling away from faith. Therefore the Lord will by no means allow us to die in faith, or those who seem weak to fall away from it.

Commentary on Romans ↗

Thomas Aquinas

Then when he says, for none of us lives to himself, he proves the same thing from the intention of believers. First, he rejects an inordinate intention, saying: I am correct in saying that everyone stands or falls before his master, for none of us lives to himself, in his natural or in his supernatural life, about which it says in Hebrews: my just man lives by faith (Heb 2:4). …

Commentary on Romans ↗