The practice of external vice, just in proportion to its grossness, incapacitates us for perceiving what is true or loving what is good. By vice is not meant crime such as exposes us to punishment by the law of the land, but sins against the laws of God, that bring their own punishment with them, by defacing the image of God in the soul. There is always need of searching the heart to find if we have committed crimes against the soul; for the laws of the land deal only with the excessive derelictions from right which we cannot ignorantly commit. We may, however, go on unconsciously in the commission of great sins until our hearts become hardened against all emotions of heavenly affection, and our eyes blinded so that we cannot distinguish the difference between darkness and light. If we would avoid this fearful condition, we must often go to the Gospels, and place the words of the Lord, in their various teachings, especially as they come to us from the Mount, as it were in judgment over against us, and reading verse by verse, fathom the depths of our hearts, and confess whether we are guilty or no. Would we escape such guilt, we must study these instructions again and again, until, as Moses commanded of the laws of the elder Scripture, "they shall be with us when we sit in our homes, or walk by the way, or lie down, or rise up. And we shall bind them for a sign upon our hands, and they shall be as frontlets between our eyes. And we shall write them upon the posts of our houses, and upon our gates."