11 As strangers, or sojourners. There are two parts to this exhortation, — that their souls were to be free within from wicked and vicious lusts; and also, that they were to live honestly among men, and by the example of a good life not only to confirm the godly, but also to gain over the unbelieving to God.
And first, to call them away from the indulgence of carnal lusts, he employs this argument, that they were sojourners and strangers. And he so calls them, not because they were banished from their country, and scattered into various lands, but because the children of God, wherever they may be, are only guests in this world. In the former sense, indeed, he called them sojourners at the beginning of the Epistle, as it appears from the context; but what he says here is common to them all. For the lusts of the flesh hold us entangled, when in our minds we dwell in the world, and think not that heaven is our country; but when we pass as strangers through this life, we are not in bondage to the flesh.
By the lusts or desires of the flesh he means not only those gross concupiscences which we have in common with animals, as the Sophists hold, but also all those sinful passions and affections of the soul, to which we are by nature guided and led. For it is certain that every thought of the flesh, that is, of unrenewed nature, is enmity against God. (Romans 8:7.)
Which war against the soul Here is another argument, that they could not comply with the desires of the flesh, except to their own ruin. For he refers not here to the contest described by Paul in Romans 7:14, and in Galatians 5:17, as he makes the soul to be an antagonist to the flesh: but what he says here is, that the desires of the flesh, whenever the soul consents to them, lead to perdition. He proves our carelessness in this respect, that while we anxiously shun enemies from whom we apprehend danger to the body, we willingly allow enemies hurtful to the soul to destroy us; nay, we as it were stretch forth our neck to them.