And when he had agreed with the laborers for a penny a day, he sent them into his vineyard.
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Cyril of Alexandria
AD 444
He gives to all “their single denarius,” which is the grace of the Spirit, perfecting the saints in conformity with God and impressing the heavenly stamp on their souls and leading them to life and immortality.
The Roman penny, or denarius, was the 8th part of an ounce; which, at the rate of 5s. per ounce, is 7½d. It is put here for the usual hire of a day-labourer.
What then does the parable mean? For it is necessary first to make this clear; then we will unravel the other point. By the vineyard he means the commandments of God, and the time of working refers to the present life. The workers—those called to the task at different times: early, at the third hour, at the sixth, at the ninth, at the eleventh—are those who have come forward at different ages and lived justly. The Gospel of Matthew, Homily