Isaiah 14:14

I will ascend above the height of the clouds; I will make myself like the Most High. But (in fact) you will be brought down to Sheol, to the remote accesses of the pit (the region of the dead).

We need to get it into our minds that we are fighting an already defeated foe.  God, through Jesus dying as a substitute for us, gave us dominion over the devil.  When we walk in our authority, we walk all over any evil that tries to hurt us.  Our profession of faith by using God’s word is the key.