Pelagius — on Rom 12:1 (PELAGIUS'S COMMENTARY ON ROMANS)

“Because Paul has already mentioned the mind of the Lord, he now instructs them how they ought to conduct themselves so that they are worthy to have the mind of the Lord. They possessed nothing greater than the mercy of God because they had been set free by it. They were to present their bodies, not those of animals, as under the law, which (in spite of the fact that they were a symbolic offering) were nevertheless offered up healthy and unblemished. The living sacrifice was to be pure and free from the total death of sin. It should be pleasing only to God, not to other people. Every good work pleases God if it is done in a reasonable manner. For one is deprived of one's reward if, for example, one fasts for public notice, for then one is performing a good deed in a foolish way. And the same applies to all vices that border on virtues.”