We have two weapons to deal with deceptions: the belt of truth (Ephesians 6:14) and the sword of the Spirit (Ephesians 6:17) which is the Word of God. Both are truth, which is found in God’s Word, so why are they given two different names (a sword and a belt)? Because one is meant to be defensive (the belt), while the other is meant to be offensive (the sword). This means that the Word of God is both an offensive and a defensive weapon. A belt is something you wear to guard against an attack, while a sword is used to slaughter the enemy.
You use the belt of truth (God’s Word) to guard against the enemy’s deception (lies) he sends your way, while you use the sword of the Spirit (also God’s Word) to tear down existing strongholds (deception that took hold) in your mind.
In Romans 12:2, we are told to “be not conformed to this world: but be ye transformed by the renewing of your mind.” How do we renew our minds? By getting in God’s Word! In Ephesians 5:26, this process is referred to as washing of water by the Word: “That he might sanctify and cleanse it with the washing of water by the word.”