Adam Clarke on Ecclesiastes 11:8

If a man live many years - And even have prosperity through the whole; yet the days of darkness - times of affliction, weakness, and perhaps old age, will be many. If he die not a violent death, which no man can wish, he will die a lingering death; and this is ordinarily attended with many pains, and many sorrows; therefore let him prepare to meet his God; and to carry this thought through life, that all must terminate in death. The writer of Ecclesiasticus, 7:36, has a good saying, similar to this: "Whatsoever thou takest in hand, remember thy End; and thou shalt never do amiss;" ουκ ἁμαρτησεις, thou wilt not sin.