And I am afraid there are Calvinists, who, while they account it a proof of their humility that they are willing in words to debase the creature, and to give all the glory of salvation to the Lord, yet know not what manner of spirit they are of. Whatever it be that makes us trust in ourselves that we are comparatively wise or good, so as to treat those with contempt who do not subscribe to our doctrines, or follow our party, is a proof and fruit of a self-righteous spirit. Self-righteousness can feed upon doctrines, as well as upon works; and a man may have the heart of a Pharisee, while his head is stored with orthodox notions of the unworthiness of the creature and the riches of free grace.

- John Newton (coincidentally quoted in a book by the author below named, Reformed Is Not Enough)

Are you children of Abraham? Don’t show us the papers of your family tree — do the works of Abraham. Are you Lutherans? Then preach like Luther did. Are you children of Calvin? Then do the works of Calvin. Don’t read us the words of Calvin in a monotone; don’t read them off the marble monument you set up in the lobby of the Reformed museum. And if you try to read them in that monotone, and I object, don’t try to make it appear that I have problem with his words. Preach them to the world in the open air; preach them in such a way that people start accusing you of being a madman, or drunk, or evil, or something. Preach them in such a way that people set up anonymous websites to destroy your reputation. Don’t pin his words to a poster board like a row of dead but orthodox butterflies.

- Doug Wilson, “Orders of Magnitude” on Blog and Mablog