Spurgeon hates sin, and rightly so. It is, in part, a reflection of his love to Christ, and his love to Christ only increases as he considers the sinfulness of sin. This is a profoundly insightful sermon, with shades of John Owen's books on temptation and the mortification of sin, a sort of anatomy of sin, at least in the way that it tries to draw us into darkness and wickedness. So first we think about the way in which sin deceives, given that its very nature is to assault the truth of God and the God of truth. Spurgeon spends a large proportion of the sermon telling us the kinds of lies which sin whispers in our ears and to our hearts. If we have never thought about this, then the sermon will shock us and teach us. Then we think about the way in which this deceit tends to harden the heart, and again we are in the realm of spiritual experience, and the gradual coarsening of the conscience, the increasing carelessness with regard to conduct, that comes when we listen to sin's lying tongue and begin to act accordingly. Finally, branching out a little from the text, we are urged to fight against deceiving sin by faith, by confession, by tenderness of heart, and by exhorting one another daily—and that means a willingness both to receive and to give appropriate exhortation. We are not a pack of barking dogs, nipping at each other constantly and unkindly, but we are to look out for each other, both as we commit sins and omit duties. Loaded with pastoral wisdom, here is an outstanding reminder of our susceptibility to sin, and our need to be on guard against it.