I like the way David handled the enemy Goliath. When facing the giant, he named his strength and spoke from God's point of view.
"You come to me carrying a sword and a javelin, but I COME ARMED WITH THE NAME OF THE ETERNAL GOD - the true God of the armies of Israel, the one you have insulted."
Then in Revelations, we are told that we overcome the enemy by the word of our testimony and the blood of the Lamb.