On self-righteousness

"...naturally it is a harder matter to part with self-righteousness than to part with gross sins; for that is more deeply rooted upon the stock of self-love, a principle which departs not from us without our very nature. It has more arguments to plead for it; it has a natural conscience, as a patron for it. Whereas a great sinner stands speechless at reproofs, an outward law-keeper has the strong reinforcement of natural conscience within his own breast. It was not the gross sins of the Jews against the light of nature, so much as the establishing the idol of their own righteousness, that was the block to hinder them from submitting to the righteousness of God (Rom. 10:8)."

From The Chief of Sinners Objects of the Choicest Mercy, by Stephen Charnock.