John Newton

"I readily believe that the leading points of Arminianism spring from and are nourished by the pride of the human heart! But I would be glad if the reverse were always true; and that to embrace what are called the Calvinistic doctrines was an infallible token of a humble mind! I think I have known some Arminians, that is, people who for lack of a clearer light, have been afraid of receiving the doctrines of free grace, who yet have given evidence that their hearts were in a degree humbled before the Lord. 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 are of a prideful, harsh and bitter spirit. Whatever it is 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!"
                     -   John Newton