The Puritans rightly discerned the realtionship between the soundness of one's doctrine and the soundness of his walk before God and his fellow man. In this rear Puritan work, Jeremiah Burroughs (1599-1646) shows from Scripture the great sin of thinking as the world thinks rather than thinking God's thoughts after Him. May it please God to use this work to help us to think on a heavenly level and act in a heavenly manner!