For this is the will of God: your sanctification, that you abstain from sexual immorality,
      2. The matter of his exhortation--that they would abound more and more in holy walking, or excel in those things that are good, in good works. Their faith was justly famed abroad, and they were already examples to other churches: yet the apostle would have them yet further to excel others, and to make further progress in holiness. Note, (1.) Those who most excel others fall short of perfection. The very best of us should forget those things which are behind, and reach forth unto those things which are before. (2.) It is not enough that we abide in the faith of the gospel, but we must abound in the work of faith. We must not only persevere to the end, but we should grow better, and walk more evenly and closely with God.