Notes on the Bible, by Albert Barnes, [1834], at sacred-texts.com
The Preacher in this chapter contemplates the case of people to whom God gives wealth, honor, success, children, and long life, yet withholds from them the capacity of enjoyment, rest, permanence or contentment Ecc 6:1-9. What then is good for man to do, whose lot in life is so thoroughly subject to vanity? Ecc 6:10-12.
Common among - Rather, great (heavy) upon people.
No burial - For a corpse to lie unburied was a circumstance in itself of special ignominy and dishonor (compare the marginal references).
He ... his - Rather, it ... its. The untimely birth is spoken of.
Rather, it hath not seen nor known the sun: this (the untimely birth) hath rest rather than the other.
He live - Rather, he hath lived. "He" refers to the man Ecc 6:3. His want of satisfaction in life, and the dishonor done to his corpse, are regarded as such great evils that they counterbalance his numerous children, and length of days, and render his lot viewed as a whole no better than the common lot of all.
Connect these verses with Ecc 6:2-3 : "All labor is undertaken with a view to some profit, but as a rule the people who labor are never satisfied. What advantage then has he who labors if (being rich) he is wise, or if being poor he knows how to conduct himself properly; what advantage have such laborers above a fool? (None, so far as they are without contentment, for) a thing present before the eyes is preferable to a future which exists only in the desire."
What - literally, what profit (as in Ecc 1:3).
Knoweth ... living - i. e., "Knows how to conduct himself rightly among his contemporaries."
Or, "That which has been named - i. e., events past or current, either Ecc 1:9 as they present themselves to man, or Ecc 3:15 as they are ordered by God - was long ago (i. e., was decreed, its nature and place were defined by the Almighty), and was known that it is man;" i. e., the course of events shapes the conduct and character of man, so that what he does and suffers is said to be or constitute the man. God from the beginning definitely ordained the course of events external to man, and constituted man in such a way that events materially affect his conduct and his destiny. Hence, God, by withholding from certain people the gift of contentment, and thus subjecting them to vanity, is acting according to the predetermined course of His Providence which man cannot alter (compare Rom 8:20). Others translate, "What there is, its name is named long ago and known, that it is man;" i. e., "What hath been and is, not only came into existence long ago Ecc 1:9; Ecc 3:15, but also has been known and named, and is acknowledged that it, besides other things, is specially man; that man always remains the same, and cannot go beyond his appointed bounds."
Him that is mightier - i. e., God; compare Ecc 9:1; Co1 10:22, and marginal references.
Things - Namely, the various circumstances detailed in the foregoing chapters, from the Preacher's personal experience, and his observation of other people, ending with the comprehensive declaration in Ecc 6:10 to the effect that vanity is an essential part of the constitution of creation as it now exists, and was foreknown.
What is man the better? - Rather, what is profitable to man?
After him - i. e., On earth, in his own present sphere of action, after his departure hence (compare Ecc 2:19; Ecc 3:22).