“Be sober, be vigilant; because your adversary the devil walks about like a roaring lion, seeking whom he may devour” — 1Peter5:8
In their natural habitat, the hunger of a lion tell them to go hunting. They seek the young, weak, sick or injured. Peter used “a roaring lion” as a metaphor for Satan. He is a confident predator, looking for an easy prey to devour.
In dealing with this adversary, God’s children must be vigilant at putting “on the whole armor of God” and thus they can “be strong in the Lord and in the power of His might” (Eph6:10-11)
No evil can penetrate the armor of God.