John Bunyan

If thou wouldest be a good neighbour, take heed of thy tongue…That thou with it give no offensive language to thy neighbour, to the provoking of him to anger. Bear much, put up wrongs, and say little…And as thou shouldest take heed that thou be not the original of contention and anger, so also take heed that thou be not an instrument to beget it between parties, by tale-bearing and a gossiping spirit: “He that passeth by, and meddleth with strife belonging not to him, is like one that taketh a dog by the ears.”

Frederick W Faber

With the help of grace, the habit of saying kind words is very quickly formed, and when once formed, it is not speedily lost. Sharpness, bitterness, sarcasm, acute observation, divination of motives, – all these things disappear when a man is earnestly conforming himself to the image of Christ Jesus. The very attempt to be like our dearest Lord is already a well-spring of sweetness within us, flowing with an easy grace over all who come within our reach.

David A. Powlison

We are meant to live with God on the throne, with a wide-open heart to him and others. But a contentious, judgmental person has shrivelled up inside, shutting down to both God and neighbour. On the outside, a contentious person speaks rotten words that tear down rather than build up and condemn rather than give grace (Ephesians 4:29). On the inside, a person swept up in sinful anger has become demonic and diabolical—in the truest sense—an image-bearer of the hostile critic of God’s people (James 3:15;4:7).