Jonathan Edwards

The first and the great work of a Christian is about his heart. Do not be content with seeming to do good in ‘outward acts’ while your heart is bad, and you are a stranger to the greater internal heart duties. See that your chief study be about your heart; that there God’s image may be planted; that there His interests be advanced; that there the world and flesh are subdued; that there the love of every sin is cast out; that there the love of holiness grows.