The Battle of the Flesh

The desires of the flesh are against the Spirit, and the desires of the Spirit are against the flesh.
The Battle of the Flesh
When someone becomes aware of this battle of the flesh, he should not lose heart on this account; but by the Spirit he should fight back and say: "I am a sinner, and I am aware of my sin; for I have not yet put off my flesh, to which sin will cling as long as it lives. But I will obey the Spirit rather than the flesh. That is, by faith and hope I will take hold of Christ. I will fortify myself with His Word, and thus fortified I will refuse to gratify the desires of the flesh." . . . Thus there is great comfort for the faithful in this teaching of Paul's, because they know that they have partly flesh and partly Spirit, but in such a way that the Spirit rules and the flesh is subordinate, that righteousness is supreme and sin is a servant.

From Lectures on Galatians (1535) (Luther's Works 27:72-74)
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