When his fellow-servants saw what was done. Though we ought not to search for mystery in these words -- because they contain nothing but what nature teaches, and what we learn by daily experience -- we ought to know that the men who live among us will be so many witnesses against us before God; for it is impossible but that cruelty shall excite in them displeasure and hatred, more especially, since every man is afraid that what he sees done to others will fall upon his own head. As to the clause which immediately follows, it is foolish to inquire how God punishes those sins [1] which he has already forgiven; for the simple meaning is this: though he offers mercy to all, yet severe creditors, from whom no forgiveness can be obtained, are unworthy of enjoying it.

Footnotes

1 - "Comment il est possible que Dieu punisse;" -- "how it is possible for God to punish."

So when his fellow-servants - This is a mere circumstance thrown into the story for the sake of keeping, or making a consistent narrative. It cannot be intended to teach that other Christians should go and tell God what a brother has done; for God well knows all the actions of his children, and does not need us surely to inform him of what is done. It is abusing the Bible, and departing from the design of parables, to press every circumstance, and to endeavor to extract from it some spiritual meaning. Our Saviour, in this parable, designed most clearly to exhibit only one great truth - the duty of forgiving our brethren, and the great evil of not forgiving a brother when he offends us. The circumstances of the parable are intended only to make the story consistent with itself, and thus to impress the general truth more fully on the mind.

His fellow-servants saw what was done - An act of this kind is so dishonorable to all the followers of Christ, and to the spirit of his Gospel, that through the respect they owe to their Lord and Master, and through the concern they feel for the prosperity of his cause, they are obliged to plead against it at the throne of God.

So when his fellow servants saw what was done,.... What hard usage, and ill treatment, their fellow servant met with; the Syriac reads, "their fellow servants", being the fellow servants both of the creditor and the debtor:
they were very sorry; they were greatly grieved and troubled at the cruelty of the one, and the unhappiness of the other; being more tenderhearted, and of a more forgiving spirit than he:
and came and told unto their Lord all that was done; to their fellow servant, by one that had so lately received such favours from him: this may be expressive of the concern of some members of churches at such conduct: who, though they may not have strength and number sufficient to oppose such measures, yet being secretly grieved at such cruel methods, go to the throne of grace, and spread the case before the Lord, tell him all that is done by way of complaint; which, is no impeachment of his omniscience, only shows their trouble for such malpractices, and the sense they have, by whom only such grievances can be redressed.

His fellow-servants . . . were very sorry. Unmerciful treatment of the unfortunate is always wont to excite compassion. The servants were not only sorry for their wretched comrade, but they carried the case to their lord. It is always proper to carry the wrongs of fellow-beings which we cannot redress to our Heavenly Father.