"25Agree with thine adversary quickly, whiles thou art in the way with him; lest at any time the adversary deliver thee to the judge, and the judge deliver thee to the officer, and thou be cast into prison. 26Verily I say unto thee, Thou shalt by no means come out thence, till thou hast paid the uttermost farthing." (Matthew 5:25-26)
Every human being is born dead in their trespasses on this earth.
From Adam and Eve, who ate from the forbidden tree, to the newborns born in this new year, we all have a debt which we cannot pay:
"And you hath he quickened, who were dead in trespasses and sins;" (Ephesians 2: 1)
and then
"And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses;" (Colossians 2:13)
Man's debt is so great, that he cannot pay it.
Then why did Jesus say on the Sermon on the Mount that we need to agree with our adversary?
His primary audience for this sermon were disciples, people who believed that they could emulate and imitate Jesus, who say Him as a master as a teacher, and not a savior.
For those who believed that they could pay for their sins, make amends for all that they have done, Jesus posited to them that they must agree with the adversary, lest they be cast into prison and pay to the last.
Jesus paid for all our sins, carried all our debt, and redeemed us:
"For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:" (1 Peter 3: 18)
Peter wonderfully reminds us "once" Jesus suffered, and His perfect work has brought us to God, that we may receive His quickening Spirit.
Before Jesus died on the Cross, Satan could stand before God and accuse us for our sins. When Jesus died on the Cross, God the Father provided the perfect an forever payment, so that we need never have to bear or carry or pay off any debt ever again!
"For whosoever shall call upon the name of the Lord shall be saved." (Romans 10: 13)
and
"Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree" (Galatians 3: 13)
and
"For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:" (Ephesians 2: 8)
and
"Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost;" (Titus 3: 5)
To His disciples, Jesus told them to pay up for every sin, to agree with every adversary, or be taken to a prison where they would have to pay for everything to the last. When we understand that of ourselves we can pay nothing, then we freely receive all that Jesus has done for us, in that God the Father gave the Son, and through Him we receive all things (Romans 8: 31-32)