Hebrews 12:11 - Matthew Poole's English Annotations on the Holy Bible

Now no chastening for the present seemeth to be joyous, but grievous: a further argument to persuade Christians not to despise nor faint under the Lord's chastenings, is the good issue of them, subjoined to fortify them against the suggestions of flesh and blood, as if they could not be from love, nor for good, because they are smarting and grievous; therefore the Spirit asserts the truth as to both: All these chastenings and rebukes that the Father of spirits inflicts on his children, not one excepted, are, for all the time they are so inflicted, sensed by his children to be as they are; they feel them to have no joy in them, but a great deal of grief, pain, and smart; they are not pleasing of themselves, and God would not have them to be so, but his to feel the smart of his rod, when he corrects them with it. Nevertheless afterward it yieldeth the peaceable fruit of righteousness unto them which are exercised thereby; yet have not his children any reason to despond or faint under them; for they are not always to continue, and there accrueth after them a benefit to them, that will make amends for them all the afterward following to eternity: this chastening rendereth and bringeth forth to all the corrected children, who labour to improve the smart, under God's direction and blessing, a righteous compliance with the whole will of God, and a purging out of all sin, Isaiah 27:9; filling the soul full of joy and peace, and securing to the chastened a confluence of all that good that will abundantly reward them for their sufferings, setting them above them, and making them blessed, Isaiah 32:17 Romans 5:1-5 James 1:2-4.