The uttermost farthing - Κοδραντην. The rabbins have this Greek word corrupted into קרדיונטסס kordiontes, and קונטריק, kontrik, and say, that two פרוטות prutoth make a kontarik, which is exactly the same with those words in Mark 12:42, λεπτα δυο, ο εστι κοδραντης, two mites, which are one farthing. Hence it appears that the λεπτον lepton was the same as the prutah. The weight of the prutah was half a barley-corn, and it was the smallest coin among the Jews, as the kodrantes, or farthing, was the smallest coin among the Romans. If the matter issue in law, strict justice will be done, and your creditor be allowed the fullness of his just claim; but if; while you are on the way, going to the magistrate, you come to a friendly agreement with him, he will relax in his claims, take a part for the whole, and the composition be, in the end, both to his and your profit.
This text has been considered a proper foundation on which to build not only the doctrine of a purgatory, but also that of universal restoration. But the most unwarrantable violence must be used before it can be pressed into the service of either of the above antiscriptural doctrines. At the most, the text can only be considered as a metaphorical representation of the procedure of the great Judge; and let it ever be remembered, that by the general consent of all (except the basely interested) no metaphor is ever to be produced in proof of any doctrine. In the things that concern our eternal salvation, we need the most pointed and express evidence on which to establish the faith of our souls.

Verily I say unto thee, Thou shalt by no means come out thence, till thou hast (q) paid the uttermost farthing.
(q) You will be dealt with in this manner, to the utmost extremity.

Verily, I say unto thee,.... This may be depended upon, you may assure yourself of it, that
thou shalt by no means come out thence, from prison,
till thou hast paid the uttermost farthing, or "last farthing"; or as the Ethiopic version reads it, "till thou hast exactly paid all"; which seems to express the inexorableness of the creditor, and the impossibility of the debtor's release.

Verily I say unto thee, Thou shalt by no means come out thence, fill thou hast paid the uttermost farthing--a fractional Roman coin, to which our "farthing" answers sufficiently well. That our Lord meant here merely to give a piece of prudential advice to his hearers, to keep out of the hands of the law and its officials by settling all disputes with one another privately, is not for a moment to be supposed, though there are critics of a school low enough to suggest this. The concluding words--"Verily I say unto thee, Thou shalt by no means come out," &c.--manifestly show that though the language is drawn from human disputes and legal procedure, He is dealing with a higher than any human quarrel, a higher than any human tribunal, a higher than any human and temporal sentence. In this view of the words--in which nearly all critics worthy of the name agree--the spirit of them may be thus expressed: "In expounding the sixth commandment, I have spoken of offenses between man and man; reminding you that the offender has another party to deal with besides him whom he has wronged on earth, and assuring you that all worship offered to the Searcher of hearts by one who knows that a brother has just cause of complaint against him, and yet takes no steps to remove it, is vain: But I cannot pass from this subject without reminding you of One whose cause of complaint against you is far more deadly than any that man can have against man: and since with that Adversary you are already on the way to judgment, it will be your wisdom to make up the quarrel without delay, lest sentence of condemnation be pronounced upon you, and then will execution straightway follow, from the effects of which you shall never escape as long as any remnant of the offense remains unexpiated." It will be observed that as the principle on which we are to "agree" with this "Adversary" is not here specified, and the precise nature of the retribution that is to light upon the despisers of this warning is not to be gathered from the mere use of the word "prison"; so, the remedilessness of the punishment is not in so many words expressed, and still less is its actual cessation taught. The language on all these points is designedly general; but it may safely be said that the unending duration of future punishment--elsewhere so clearly and awfully expressed by our Lord Himself, as in Matthew 5:29-30, and Mark 9:43, Mark 9:48 --is the only doctrine with which His language here quite naturally and fully accords. (Compare Matthew 18:30, Matthew 18:34).
The Same Subject Illustrated from the Seventh Commandment (Matthew 5:27-32).

Thou shalt not come out from thence. After the debtor was cast into prison he was held until the debt was paid, and if it were not, he remained in prison until he died.
Farthing. A small, insignificant copper coin. The warning against lawsuits is clear, but there is a higher idea still. The Lord would warn us to make everything right before it is too late. Before the judgment there is a chance; after it there is nothing but payment.

Till thou hast paid the last farthing - That is, for ever, since thou canst never do this. What has been hitherto said refers to meekness: what follows, to purity of heart.