But the LORD, who brought you up out of the land of Egypt with great power and a stretched out arm, Him shall ye fear, and Him shall ye worship, and to Him shall ye do sacrifice. – 2Kings 17:36

God’s church is very fond of building walls which her God has not sanctioned. She is not content to trust in the arm of God, but she will add thereto some extraneous help which God utterly abhors. “Beautiful for situation-the joy of the whole earth-is Mount Zion, upon the sides of the north, the city of the great king. As the mountains are round about Jerusalem, even so is God round about His people, from henceforth, for evermore.” But His people are not content with God being round about them, they seek some other protection. The church has very often gone to king Jareboam for help, or to the world for aid; and then God has said to her enemies, “Go ye up against her, but make not a full end: take away her battlements, for they are not the Lord’s. She shall not have them. I am her battlement. She is to have none other.”

God will not have his church relying on man and putting trust in princes. “Cursed shall be such-a-one,” He says, “he shall be like a heath in the desert, he shall not see when good cometh; his leaf shall wither and he shall bring forth no fruit unto perfection.” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0038.cfm