Until the day break, and the shadows flee away, turn, my beloved, and be thou like a roe or a young hart upon the mountains of Bether. – Song 0f Songs 2:17

A child of God, who is a child of light, may be for a while in darkness; first, darkness comparatively, as compared with the light he has some times enjoyed, for days are not always equally bright. Some days are bright with a clear sunshine, other days may be overcast. So the child of God may one day walk, with full assurance of faith, in close fellowship with the Father and with His Son Jesus Christ; and at another time he may be questioning his interest in the covenant of grace, and may be rather sighing than singing, rather mourning than rejoicing. The child of God may be, then, in comparative darkness. Sometimes, neither sun nor moon appears for a long season to cheer the believer in the dark. This may arise partly through sickness of body. There are sicknesses of the body which in a very peculiar way touch the soul; exquisite pain may yet be attended with great brightness and joy, but there are certain other illnesses which influence us in another way. Terrible depressions come over us; we walk in darkness, and see no light. I should not like to guess how heavy a true heart may sometimes become; there is a needs-be that we be in heaviness through manifold trials. There is not only a needs-be for the trials, but also for the heaviness which comes out of them. It is not always that a man can gather himself together, and defy the fierce blasts, and walk through fire and through water with heavenly equanimity. No, brethren, “a wounded spirit who can bear?” and that wounded spirit may be the portion of some of the very fairest of the sons of God; indeed, the Lord has some weakly, sickly sons who, nevertheless, are the very pick of His family. It is not always the strong ones by whom He sets the most store; but, sometimes, those that seem to be driven into a corner, whose days are spent in mourning, are among the most precious in His sight. Yes, the darkness of the child of God may be comparative darkness, and it may to a great extent be positive darkness. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2477.cfm