But he who was of the bondwoman was born after the flesh; but he of the freewoman was by promise. – Galatians 4:23

You shall find, dear brother, that if you enjoy fellowship with God, if you live in the spirit of adoption, if you are brought near to the Most High, so as to be a member of the divine family, straightway all those who are under bondage to the law will quarrel with you. Thus saith the apostle, “As then he that was born after the flesh persecuted him that was born after the Spirit, even so it is now.” The child of Hagar was found by Sarah mocking Isaac, the child of promise. Ishmael would have been glad to have shown his enmity to the hated heir by blows and personal assault, but there was a superior power to check him, so that he could get no further than “mocking.” So it is just now. There have been periods in which the enemies of the gospel have gone a great deal further than mocking, for they have been able to imprison and burn alive the lovers of the gospel; but now, thank God, we are under His special protection as to life and limb and liberty, and are as safe as Isaac was in Abraham’s house. They can mock us, but they cannot go any further, or else some of us would be publicly gibbeted. But trials of cruel mockings are still to be endured, our words are twisted, our sentiments are misrepresented, and all sorts of horrible things are imputed to us, things which we know not, to all which we would reply with Paul, “Am I therefore become your enemy because I tell you the truth?” This is the old way of the Hagarenes, the child after the flesh is still doing his best to mock him that is born after the Spirit. Do not be astonished, neither be grieved in the least degree when this happens to any of you, but let this also turn to the establishment of your confidence and to the confirmation of your faith in Christ Jesus, for he told you of old, “If ye were of the world, the world would love his own: but because ye are not of the world, but I have chosen you out of the world, therefore the world hateth you.” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1435.cfm