St. Mark the Ascetic: We are debtors to Christ to serve Him till our death
If "Christ died on our account in accordance with the Scriptures" (Rom. 5:8; 1 Cor. 15:3), and we do not "live for ourselves", but "for Him who died and rose" on our account (2 Cor. 5:15), it is clear that we are debtors to Christ to serve Him till our death. How then can we regard sonship as something which is our due?
St. Mark the Ascetic