For I could wish that myself were accursed from Christ for my brethren, my kinsmen according to the flesh who are Israelites… – Romans 9:3,4

Who are these people for whom Paul was anxious beyond measure? To begin with, they were his worst enemies! The name of Paul brought the blood into the face of a Jew. He spat in rage. More than 40 of them had bound themselves with an oath that they would slay him (Acts 23:12-35) and the whole company of the circumcised seemed, wherever he went, to be moved by the same impulse. He frequently gathered large congregations of Gentiles who attended to him earnestly, but the Jews stirred up riots and mobs and, frequently, he was in danger of his life from them. They detested him, regarding him as an accursed apostate from the faith of his fathers…His generous retaliation was to pray for them—no, more—to carry the whole nation on his heart as a burden. “I have great heaviness,” says he, “and continual sorrow of heart for my kinsmen according to the flesh.” Now, if any of you, in following Christ, should meet with opposition, avenge it in the same way! Love most the man who treats you worst! If any man would kill you in his anger, kill him with your loving prayers. If he strikes you on one cheek, turn to him the other, also, in submission and lift both hands and eyes to Heaven and cry, “Father forgive them, for they know not what they do!”

Never let oppressors see your anger. They will observe your emotion and your grief and they will perceive that you are naturally vexed and troubled but let them also see that you bear them no malice and only desire their welfare. I commend this to those who have a hard fight for Christ in the workroom, in the midst of sneers and jests. Never use the devil’s weapons, though they lie very handy and look very suitable. Only use Christ’s Omnipotent weapon of love and so shall you be His disciples. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1425.cfm