You must know your weapon, the Sword of the Spirit, the Word of God given to men for the sake of life and godliness, for wisdom and understanding, for the sake of life and order. You must also know how that Word applies to unbelief and the fruiting flower of the root of sinful rebellion today. Every worldview says something of where we come from and also where we are going (cosmology and eschatology). Let's learn how to answer the unbelief around us.