In the Marines they have an exercise that is called “The Bag.” In the Marines you are encouraged to name your rifle, the reasoning behind it is that you will never forget it, or forsake it, because it is your life line. “The Bag” is a simulation of night time problemsolving. A soldier has a bag placed over his head and he is told to take he weapon apart and then put it back together again. The reasoning behind this is that during a fire fight, if your gun gets jammed you can fix the problem with out using your eyes. The key is to know your weapon, every single part and how it works together.
2 Tim 2:15
15 Do your best to present yourself to God as one approved, a workman who does not need to be ashamed and who correctly handles the word of truth.
12 For the word of God is living and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart.
We need to know the weapon that God has given us to do battle against the forces of darkness.