Romans 8:5-8
(5) For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit.
(6) For to be carnally minded is death; but to be spiritually minded is life and peace.
(7) Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.
(8) So then they that are in the flesh cannot please God.
In these verses Paul answered the implied question, What does it mean to live according to the sinful nature and according to the Spirit? He explained that the former means having their minds set on (phronousin, pres. tense, “keep on being mindful of or aspiring for”) what that nature desires. An unbeliever cares only for his sinful interests and has no regard for God. The exact opposite is true of those who live according to the Spirit. They aspire for or have their minds set on what the Spirit desires. The sinful nature and the indwelling Spirit are in conflict (Gal. 5:17).
But what difference does it make whether a person is mindful of the flesh or of the Spirit? Again Paul explained. The mind (phronema, “mind-set, aspirations”; cf. Rom. 8:6b-7) of sinful man (tes sarkos, “of the flesh”) is death, that is, it is equivalent to death, or it leads to death in all its forms (physical and spiritual). On the other hand the mind (phronema, “mind-set, aspirations”) controlled by the Spirit (lit., “of the Spirit”) is life (eternal resurrection life) and peace immediately (5:1) and ultimately. In 8:7-8 Paul focused only on the sinful mind (phronema tes sarkos, “mind-set, aspirations of the sin nature”; cf. v. 6) to explain why he said (v. 6) that it ends up in death: (1) It is hostile to God (cf. 5:10); (2) it does not submit (pres. tense, “is not submitting”) to God’s Law; and (3) it cannot do so. The result is that those controlled by the sinful nature cannot (pres. tense, “are not able to”) please God. The unsaved lead lives that are totally void of spiritual life and ability. A believer, then, who gives in to his sin nature is acting like the unsaved (cf. 1 Cor. 3:3).
Excerpt from:
Walvoord, J. F., Zuck, R. B., & Dallas Theological Seminary. (1983-c1985). The Bible knowledge commentary : An Exposition of the Scriptures. Wheaton, IL: Victor Books.
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