We need to be wise to the devices and tactics of the enemy or he will exploit our weaknesses.
If we know the "Word" of God (Holy Bible) we can't be outmaneuvered. An ancient warrior was fitted with armor, but he still had to know how to take full advantage of the protection it afforded. The devil will try to get us to battle on his own terms, like when he tempted Jesus in the desert. Jesus never deviated from the "Word" and He was victorious. Stick with the "Word" and don't war after the flesh (the weapons of our warfare are not carnal).