The devil wants your mind; it is
your main battlefield; always wear
your full armor—the mighty Word of God—
for protection; revoke any authorization
you may have given the enemy before; he
won’t hesitate to use every available vessel
to gain access. Your mind is a gift from God.

Ephesians 6: 11-12  KJV
11 Put on the whole armour of God, that ye may be able to stand against the wiles of the devil. 12 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.

1 Peter 5:8  KJV
Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour.

James 4:7  KJV
Submit yourselves therefore to God. Resist the devil, and he will flee from you.