The vilest and the foulest thing in all creation by James Smith, Sunny Subjects for All Seasons, 1858. The Lord saw how great man's wickedness on the earth had become, and that every inclination of the thoughts of his heart was only evil all the time. Genesis 6.5 The human heart is the most deceitful of all things, and desperately wicked. Who really knows how bad it is? Jeremiah 17.9 No man by nature really believes God's representation of the human heart, nor does the young Christian realize it fully. God calls us to learn the plague of the heart. The vilest and the foulest thing in all creation is the heart of man. There are profound depths of evil there. There are the seeds of all dreadful moral maladies there. No man's conduct, as bad as it may be, is ever as bad as his heart is. Just in proportion, as we learn the plague of our own hearts, do we admire the free and distinguishing grace of God, see the need of the Holy Spirit's work and operation, value the glorious atonement of the Lord Jesus Christ. It is a life's lesson to learn the plague of one's own heart.