Found it encouraging:
Of all people who engage in controversy, we, who are called Calvinists, are most expressly bound by our own principles to the exercise of gentleness and moderation… The Scriptural maximum, that “The wrath of man worketh not the righteousness of God,” is verified by daily observation. If our zeal is embittered by expressions of anger, invective, or scorn, we may think we are doing service to the cause of truth, when in reality we shall only bring it into discredit.
John Piper (2003) The Roots of Endurance, pg. 62 & 63
Too true a statement that is not heeded often enough. Newton was a very good shepherd to his flock of people in Olney and London. A good example.