And the angel of God, which went before the camp of Israel, removed… – Exodus 14:19

God never leaves us, but we sometimes think He has done so. The sun shines on, but we do not always bask in its beams; we sometimes mourn an absent God-it is the bitterest of all our mourning. As He is the sum total of our joy, so His departure is the essence of our misery. If God does not smile upon us, who can cheer us? If He be not with us, then the strong helpers fail, and the mighty men are put to rout. If we see no cloud or flame, yet may we know that God is with us, and His power is around us. According to our text, “The angel of God, which went before the camp of Israel, removed.” The chosen of the Lord may lose the manifested presence of God; and, indeed, often they may miss it in the particular form in which they have been accustomed to enjoy it… Aforetime everything had seemed bright, and we expected to go from strength to strength, from victory to victory, till we came unto the mount of God, to dwell for ever in His rest; but now before us on a sudden things look dark; we do not feel so sure of heaven as we were, nor so certain of perpetual growth and progress… Sometimes you also may imagine that God’s promise is failing you; even the word of God which you had laid hold upon may appear to you to be contradicted by your circumstances. Then your heart sinks to the depths, for “if the foundations be destroyed, what can the righteous do?” …When the cloud of the divine glory is no longer seen in front it has gone behind, because it is more wanted there, and it is no loss after all. When the Lord hides His face for a moment, it is to make us value His face the more, to quicken our diligence in following after Him, to try our faith, and to test our graces… Oh, my Lord, if ever Thou dost leave me, forsake me not in the day of trouble. Yet what have I said? It is a day of trouble when Thou art gone, whatever my condition may be. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1793.cfm