Myriads of professing Christians at the present day have not an idea of their own sinfulness and guilt in the sight of God. They flatter themselves that they have never done anything very wicked. They have never murdered, or stolen, or committed adultery, or borne false witness. They cannot surely be in much danger of missing heaven. They forget the holy nature of that God with whom they have to do. They forget how often they break His law in temper, or imagination, even when their outward conduct is correct. They never study such portions of Scripture as the fifth chapter of Matthew, or at any rate they study it with a thick veil over their hearts, and do not apply it to themselves. The result is that they are wrapped up in self-righteousness. Like the church of Laodicea, they are “rich and increased with goods, and have need of nothing.” (Revelation 3:17) Self-satisfied they live, and self-satisfied too often they die.
Expository Thoughts on the Gospels: Mark
Via: J.C. Ryle Quotes