Religion is not an art nor a science; it is a life. It is not the mere learning and following of a set of rules. It is the growth of Christ-likeness in the heart, spreading thence into the whole of the being. It is the setting up of the kingdom of heaven within us. This kingdom in one's heart is the rule and authority of Christ, owned and recognized there at the fount and spring of the life. It is the rule of love — “the love of Christ constraineth me.” St. Paul goes still further, however, and speaks of it as a new incarnation. “Christ liveth in me,” he says. A Christian life is therefore really the personal reign of Christ in the heart of every one who accepts him. The conquest is slow — that is, the heavenly King finds his kingdom under alien sway, and to get full possession and to reign supreme and alone he must subdue the whole of the old nature. It is this work of conquest and subjugation that goes on in this world and it is not complete until the believer passes into heaven. All earthly Christian life is therefore a learning to be a Christian. We should bend all the energies of our being toward the bringing of heart, mind, and will into complete subjection to our King.