For here have we no continuing city, but we seek one to come. – Hebrews 13:14

When Israel received water out of the rock it was not bitter, but this water came out of the sand. To this day in the desert water is found in different places, but where it oozes up from a sandy bed it is almost without exception so brackish and bitter, by reason of the sand, that it is not fit for human drinking; and even the camels, unless they are sore pressed, turn away from it with great aversion. The sand has tainted it, the flavour of earth has got into the blessing. So it is with most of our blessings; by reason of our sin and infirmity too much of the flavour of earth enters into the gift of heaven. Our common mercies, when we receive them direct from heaven as God gives them, are mercies indeed-cool, flowing streams that gush from the rock of His favor; but we are so apt to trace them to the creature, so ready to look upon them as derived from earth instead of coming from heaven; and just in that proportion may we expect to find bitterness in them. What can you hope for in a wilderness, but productions congruous to it? Canaan! who looks for bitterness there? Is it not the land that flows with milk and honey? Sweet land, when shall we reach thee? Thy sweetness is but congruous to thyself: But here, in this wilderness, where we have no continuing city, who looks for the streams of Lebanon? who hopes to find Canaan’s fruits in the wilderness of Sin? As well seek to gather from the briny sea the sweet fruits of the palm or the luscious clusters of the vine, as hope to find, amidst these changing scenes, comforts that shall be all comfortable and joys that shall be all joyous. No, they will be comforts, but they will be often embittered; they will be joyous somewhat, but the earthy flavour in them will make us remember that this is not our rest.~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0987.cfm