"This then, is a plain proof that the doctrine of predestination is not a doctrine of God, because it makes void the ordinance of God; and God is not divided against himself.
[The doctrine of Predestination] directly tends to destroy that holiness which is the end of all the ordinances of God. I do not say, none who hold it are holy; (for God is of tender mercy to those who are unavoidably entangled in errors of any kind;) but that the doctrine itself, -- that every man is either elected or not elected from eternity, and that the one must inevitably be saved, and the other inevitably damned, -- has a manifest tendency to destroy holiness in general; for it wholly takes away those first motives to follow after it, so frequently proposed in Scripture, the hope of future reward and fear of punishment, the hope of heaven and fear of hell."
OK, who said that? Leave your guess in the comments section below. No google searches or cheating!
As many of you correctly guessed, this comes from John Wesley's famous sermon "On Free Grace," (1740).