Our fathers understood not Thy wonders in Egypt; they remembered not the multitude of Thy mercies… – Psalm 106:7

The tribes of Israel did not see in all this the claim which the Lord had upon them. As a people, they belonged to Him who had made them a nation. Because of what He had done for them, the Lord took up a peculiar position to them, which He would have them acknowledge. Remember how, in the twentieth chapter of Exodus, before the Lord proclaims His ten commands, He says—”I am the Lord thy God, which have brought thee out of the land of Egypt, out of the house of bondage.” By this, Jehovah separated them to be His people, and He declared Himself to be their God. During the plagues, He marked His special love to His own; for when the Lord sent a thick darkness over all the land, we read, “But all the children of Israel had light in their dwellings.” When the cattle of Egypt died, Pharaoh sent and found, upon inquiry that “there was not one of the cattle of the Israelites dead.” When the firstborn of Egypt fell dead beneath the angel’s sword, the sprinkled blood of the Passover lamb secured to all Israel protection from the midnight slaughter; and men were made to know that God did put a difference between His chosen and the men of Egypt. Yet the favored people did not understand it: the truth was conspicuous enough; but they did not perceive it as they ought to have done; neither did they practically show that they were the Lord’s people, and that He only was their God. The like slowness to take up our true position, we may see and mourn in ourselves. After all the Lord’s wonders of grace towards us, we do not exalt Him as our God, nor serve Him as his people, as we ought to do. Lord, have mercy upon us! ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2204.cfm