As no good is done, or spoken, or thought by any man without the assistance of God, working in and with those that believe in him, so there is no evil done, or spoken, or thought without the assistance of the devil, who worketh with strong though secret power in the children of unbelief. All the works of our evil nature are the work of the devil.
The Bicentennial edition of the works: Sermons III (ed. 1986) - ISBN: 9780687462124