Agree with your adversary quickly, while you are in the way with him; lest at any time the adversary deliver you to the judge, and the judge deliver you to the officer, and you be cast into prison.
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Chromatius of Aquileia
Others, who seem to have a more complete explanation, believe that the opponent here must be understood as the Holy Spirit, who opposes the vices and desires of the flesh. As the apostle points out, “The flesh lusts against the Spirit, and the Spirit against the flesh; for these are opposed to each other, so that you do not do what you would.” The Spirit indeed desires heavenly things; the flesh lusts after earthly things. The Spirit rejoices over spiritual gifts; the flesh is attracted to bodily vices. Concerning this the apostle says, “Do not grieve the Holy Spirit of God, with whom you have been sealed for the day of redemption.” Therefore, the Lord instructs us to listen to this adversary of sin and human error, upholding those things that are righteous and holy. We should obey him in all things while we are with him on the way, in the caravan of this present life. By doing so we will have peace and perpetual fellowship with him.