John Wesley on Ephesians 6:14

Having your loins girt about - That ye may be ready for every motion. With truth - Not only with the truths of the gospel, but with "truth in the inward parts;" for without this all our knowledge of divine truth will prove but a poor girdle "in the evil day." So our Lord is described, Isa 11:5. And as a girded man is always ready to go on, so this seems to intimate an obedient heart, a ready will. Our Lord adds to the loins girded, the lights burning, Lu 12:35; showing that watching and ready obedience are the inseparable companions of faith and love. And having on the breastplate of righteousness - The righteousness of a spotless purity, in which Christ will present us faultless before God, through the merit of his own blood. With this breastplate our Lord is described, Isa 59:17. In the breast is the seat of conscience, which is guarded by righteousness. No armour for the back is mentioned. We are always to face our enemies.