There is an obvious difference in the character and quality of the daily life of Christians. This difference is acknowledged and defined in the New Testament. There is also a possible improvement in the character and quality of the daily life of many Christians. This improvement is experienced by all such Christians who fulfill certain conditions. These conditions, too, form an important theme in the Word of God. The Apostle Paul, by the Spirit, has divided the whole human family into three groups: (1) The "natural man", who is unregenerate, or unchanged spiritually; (2) the "carnal man," who is a "babe in Christ," and walks "as a man"; and (3) the "spiritual man". These groups are classified by the Apostle according to their ability to understand and receive a certain body of truth, which is of things "revealed" unto us by the Spirit. Men are vitally different one from the other as regards the fact of the new birth and the life of power and blessing; but their classification is made evident by their attitude toward things revealed.