Therefore; i.e. because such is the infinite nature of the pardon to be meted out to an offending brother. The kingdom of heaven. The rule observed in the government of Christ's kingdom with regard to forgiveness is represented by the procedure of a certain earthly king.
The picture supposes some great Oriental potentate, with numerous viceroys or satraps, who have to render to him an account of revenues received. These are called servants in the sense that, though they are high officials, they are the monarch's subordinates and dependents.
Both Herodotus and Xenophon apply the term "slave" ( δοῦλος) to the great officers of state. Immense sums of money would pass through their hands. This accounts for the enormous debt of the officer in the parable.
Webster and Wilkinson compare the East India Company's collectors, who are high civil servants of the company, that is, now, of the government. If we regard the parable in a general light, as illustrating God's dealings with sinful man, we must see in the "taking account of his servants," not the judgment of the last day, but those many occasions when God makes a man turn his eyes inward and learn how he stands in the sight of his Lord.
Such occasions are sickness, misfortune, great change of circumstances, a new year, reproach of conscience, however aroused,—these and such like incidents awaken a man to his true position, show him his delinquencies and misery.