Ephesians 6:10-13 

And that about wraps it up. God is strong, and he wants you strong. So take everything the Master has set out for you, well-made weapons of the best materials. And put them to use so you will be able to stand up to everything the Devil throws your way. This is no afternoon athletic contest that we’ll walk away from and forget about in a couple of hours. This is for keeps, a life-or-death fight to the finish against the Devil and all his angels. 

Be prepared. You’re up against far more than you can handle on your own. Take all the help you can get, every weapon God has issued, so that when it’s all over but the shouting you’ll still be on your feet.