The Christian’s warfare against the enemies of salvation.
Archimandrite Nikifor’s Biblical Encyclopedia
The enemies of our salvation, indicated in Holy Scripture, are: a) the world that surrounds us; b) the flesh and its sinful lusts; c) our chief enemy — the devil (John 16:33; 1 John 2:15, 16; 5:4, 5; James 4:4; Rom. 7:14–23; 1 Pet. 2:11; Gal. 5:17; Col. 3:5, and others). The apostle Paul indicates the whole armor for the battle against the enemies of our salvation in the following words: believers must gird their loins with truth and put on the breastplate of righteousness; shod their feet with the preparation of the gospel of peace; take the shield of faith, wherewith one may quench all the fiery darts of the wicked; take the helmet of salvation, and the sword of the Spirit, which is the word of God, and finally pray always with all prayer and supplication in the Spirit (Eph. 6:13, 18).