The Christian is life is compared to a WAR! 3 enemies are identified in particular and one of them declares that there is an INTERNAL WAR.
1Pe 2:9 But you are a chosen people, a royal priesthood, a holy nation, God’s special possession, that you may declare the praises of him who called you out of darkness into his wonderful light.
1Pe 2:10 Once you were not a people, but now you are the people of God; once you had not received mercy, but now you have received mercy.
1Pe 2:11 Dear friends, I urge you, as foreigners and exiles, to abstain from sinful desires, which wage war against your soul.
1Pe 2:12 Live such good lives among the pagans that, though they accuse you of doing wrong, they may see your good deeds and glorify God on the day he visits us.
Gal 5:17 For the flesh desires what is contrary to the Spirit, and the Spirit what is contrary to the flesh. They are in conflict with each other, so that you are not to do whatever you want.
Gal 5:18 But if you are led by the Spirit, you are not under the law.
Gal 5:19 The acts of the flesh are obvious: sexual immorality, impurity and debauchery;
Gal 5:20 idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissensions, factions
Gal 5:21 and envy; drunkenness, orgies, and the like. I warn you, as I did before, that those who live like this will not inherit the kingdom of God.
Mar 14:38 Watch ye and pray, lest ye enter into temptation. The spirit truly is ready, but the flesh is weak.
Jesus says watch & pray to strengthen your willing spirit Matt 26:41
Mat 26:41 Watch and pray,
that ye enter not into temptation: the spirit indeed is willing, but the flesh is weak.