This is a wonderful commentary from Matthew Henry on the spiritual armor we must all wear as Christians. I hope you find it edifying as I do. Related texts: Isaiah 59:17, Ephesians 6:13-17, 1 Thessalonians 5:8.
"Spiritual strength and courage are needed for our spiritual warfare and suffering. Those who would prove themselves to have true grace, must aim at all grace; and put on the whole armour of God, which he prepares and bestows. The Christian armour is made to be worn; and there is no putting off our armour till we have done our warfare, and finished our course.
The combat is not against human enemies, nor against our own corrupt nature only; we have to do with an enemy who has a thousand ways of beguiling unstable souls. The devils assault us in the things that belong to our souls, and labour to deface the heavenly image in our hearts. We must resolve by God's grace, not to yield to Satan. Resist him, and he will flee. If we distrust either our cause, or our Leader, or our armour, we give him advantage.
commentary by Matthew Henry