We have said, in another place, that a true conscience depends upon a true faith. No proposition in morals is more plain. It is not our design to inquire what leads, or has led, men to a wrong faith. Whatever may be the cause of any particular belief, it is incontrovertible that, if a man believes a thing to be right, conscience cannot condemn an act performed in view of that belief. Conscience is so modified and guided by a man's faith, that it will sanction and command an act in one man which it will forbid and condemn in another. A Roman Catholic believes that he ought to pray to the Virgin Mary to intercede for him with God; and if a good Roman Catholic were to neglect his worship to the saints, his conscience would smite him, until, in some instances, he confessed his sin with tears. Now, if a good Protestant were to pray to saints, or to any other being but God, his conscience would smite him for doing that which the conscience of the Roman Catholic smote him for not doing. So the heathen mother will conscientiously throw her infant into the Ganges, or under the wheels of Juggernaut, while the conscience of a Christian mother would convict her of murder were she to do the same act. Conscience seldom convicts those whom Christians call impenitent persons for neglecting to pray, while the moment a man becomes a true believer, he will be convicted of guilt if he neglects the duty. So certainly and so clearly is it true, that a man's conscience is governed by his faith. Faith governs the _affections_. As man is constituted, no power in the universe can move his affections to an object until he believes that the object possesses some loveliness or excellency of character. The heart is affected just as much by the goodness of another, if we _believe_ that goodness to exist, as it would be if we _knew_ that it existed. No matter, in the case of the affections, whether the object in reality possesses the good qualities or not, if they are fully believed to exist, the affections will act just as certainly as though they really did exist. The affections are constituted to be governed by faith. And they act most powerfully, as was demonstrated in a previous chapter, in view of good qualities existing in another, who, under certain circumstances, exercises those qualities towards us. The fact, then, is apparent, that the conduct of man's life is influenced by what he believes; and especially that the character and action of the moral powers of his nature are governed by the principle of faith. Another most important fact in connection with this subject is, that a man's interests, temporal and spiritual, depend upon what he believes. The nature of man and the nature of things are so constituted, that the belief of falsehood always destroys man's interests, temporal or spiritual, and the belief of truth invariably guides man right, and secures his best and highest good.