There is a vanity which is done upon the earth; that there are just men, unto whom it happens according to the work of the wicked; again, there are wicked men, to whom it happens according to the work of the righteous: I said that this also is vanity.
All Commentaries on Ecclesiastes 8:14 Go To Ecclesiastes 8
Augustine of Hippo
AD 430
In fact, Solomon gives over the entire book of Ecclesiastes to suggesting, with such fullness as he judged adequate, the emptiness of this life, with the ultimate objective, to be sure, of making us yearn for another kind of life which is no unsubstantial shadow under the sun but substantial reality under the sun’s Creator. For a person becomes as insubstantial as the insubstantiality that surrounds him, and it is by God’s righteous decree that he, too, must pass away like a shadow.