18. I will be a Father unto you. This promise does not occur in one passage merely, but is repeated in various instances. Paul has added it with this view, that a recognition of the great honor to which God has exalted us, might be a motive to stir us up to a more ardent desire for holiness. For when God has restored his Church which he has gathered from profane nations, their redemption is attended with this fruit, that believers are seen to be his sons and daughters It is no common honor that we are reckoned among the sons of God: it belongs to us in our turn to take care, that we do not show ourselves to be degenerate children to him. For what injury we do to God, if while we call him father, we defile ourselves with abominations of idols! Hence, the thought of the high distinction to which he has elevated us, ought to whet our desire for holiness and purity.