But I say to you, love your enemies, bless those who curse you, do good to those who hate you, and pray for those who spitefully use you and persecute you -Matthew 5:44

Pray always, most for those who treat you worst. Make them the constant subjects of your prayer. In your actions prove the sincerity of your prayers by extra kindness towards those who are unkind to you… A Christian woman had often prayed for a very ungodly and unkind husband, but her prayers were not heard. However she did this, she treated him more kindly than she had ever done before. If there was any little thing that she could think of that would please his palate, if she had to deny herself, that would be on the table. She kept the house scrupulously comfortable, and did all she could. And one day someone said to her, “How is it that you, with such a husband can act so towards him?” “Well,” she said, “I hope I shall win his soul yet, but if not”-and then the tears came in her eyes-“all the happiness he will have will be in this life, and so I will let him have all I can possibly give him, since he has no happiness in the life to come.” Do that with the ungodly. Lay yourself out to oblige and serve them. Let it be known of you that the best way to get a good turn out of you is to do you a bad turn. “Oh!” says one, “it is too hard. Tread on a worm, and it will turn.” And is a worm to be an example to a Christian? Christ Jesus, art Thou not better for an exemplar than a poor worm that creeps into the earth? What did our Saviour do but pray for His murderers? The blood they shed redeemed them that shed it. We have heard the old story of the sandal-wood tree that perfumes the axe that cuts it. Do you so, O Christian! Perfume with your love the axe that wounds you…Be patient, be courteous, be kind-in a word, Christ-like; and how know you that these very persons who hate you most to-day will not love you well to-morrow, and come together with you to the communion table, and together rejoice in our blessed Saviour? ~ C.H.Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3512.cfm