There are two spheres of knowledge in which every one who is endeavouring after any growth in the spiritual life must be making some advance. The knowledge of God and the knowledge of self. We can all readily perceive the necessity of growth in the knowledge of God as essential to any development of the spiritual life. The connection is obvious. "This," said our Lord, "is life eternal, that they might know Thee, the only true God, and Jesus Christ Whom Thou hast sent." A certain moral sympathy is absolutely necessary as a condition of friendship, and holiness consists in friendship with God. If we would be in any sense the friends of God, we must have at least that desire for holiness without which such friendship would be impossible, the growth in the knowledge of God is the deepening of this friendship. "If we say that we have fellowship with Him and walk in darkness, we lie and do not the truth."