“The Lord hath chastened me sore.” – Psalm 118:18

When a child is chastised, two things are clear: first, that there is something wrong in him, or that there is something deficient in him, so that he needs to be corrected or instructed; and, secondly, it shows that his father has a tender care for his benefit, and acts in loving wisdom towards him. This is certainly true if his father is an eminently kind and yet prudent parent. Children do not think that there can be any need for chastening them; but when years have matured their judgment, they will know better. “No chastening for the present seemeth to be joyous;” if it did seem joyous, it would not be chastening. The “need be” is not only that we have manifold trials, but that we be in heaviness through them. In the smart of the sorrow lies the blessing of the chastisement. God chastens us in the purest love, because He sees that there is an absolute necessity for it: “for He doth not afflict willingly nor grieve the children of men.” Our fathers, according to the flesh, too often corrected us according to their own pleasure, and yet we gave them reverence; but the Father of our spirits corrects us only of necessity-a necessity to which He is too wise to close His eyes. Shall we not, therefore, pay greater reverence to Him, and bow before Him, and live? When Hezekiah was recovered of his sickness, he wrote, “O Lord, by these things men live, and in all these things is the life of my spirit.” I find not that men live by carnal pleasure, nor that the life of the spirit is ever found in the wine-vat or in the oil-press; but I do find that life and health often come to saints through briny tears, through the bruising of the flesh, and the oppression of the spirit. So have I found it, and I bear my willing witness that sickness has brought me health, loss has conferred gain, and I doubt not that one day death will bring me fuller life. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2237.cfm