Ephesians 6:12-17 makes especially clear that we are involved in a war, a spiritual war, and thus our weaponry must also be spiritual.
The Christian must tend to his weapons, as every soldier in warfare must, for not only is his life on the line but also the lives of his buddies, as he is their keeper too. Without serviceable weapons, the battle is often lost even before it begins. It is a terrifying thought to imagine oneself on a battlefield with nothing in hand to fight the enemy.
The Bible makes it clear that God has willed that this warfare is an absolute necessity for the development and preparation of His children to live in His Family Kingdom. It cannot be avoided; we cannot remain neutral. In one sense, we really have no choice. We must either fight or be lost.
John W. Ritenbaugh
The Christian Fight (Part Two)
Other Forerunner Commentary entries containing Ephesians 6:15:
1 Corinthians 15:26
1 Thessalonians 5:9