Our best duties are as so many splendid sins. Before you can speak peace in your heart, you must not only be made sick of your original and actual sin, but you must be made sick of your righteousness, of all your duties and performances. There must be a deep conviction before you can be brought out of your self-righteousness; it is the last idol taken out of our heart. The pride of our heart will not let us submit to the righteousness of Jesus Christ…And can you now say from your heart, Lord, thou mayst justly damn me for the best duties that ever I did perform? If you are not thus brought out of self, you may speak peace to yourselves, but yet there is no peace.
— George Whitefield (1714-1770), The Method of Grace