Approved weapons

If we are going to fight the good fight we must use approved weapons. Have our weapons been sanctioned by God? Saul started off trying to give David some strange weapons but those didn't work for him. We look at things like revenge in our lives as being powerful but that is not approved for us by God. Do like David and when the fight comes go with the weapons God has been having you train with. Often times God doesn't use the things in battle that we expect. What weapons are we fighting with?