Then I looked on all the works that my hands had made, and on the labor that I had expended on it: and, behold, all was vanity and like grasping the wind, and there was no profit under the sun.
All Commentaries on Ecclesiastes 2:11 Go To Ecclesiastes 2
Didymus the Blind
My hands are busy and tools fit for work. They toil and are active. And I saw that all that has been created by these visible hands and their activities, was vanity.… This kind of toil is to be rejected indeed—it is vanity. And still, most human beings act vainly. Ecclesiastes counts himself among these people; he is himself a human being. I said it already: No one who talks against wealth is heard if he is poor himself. But one who teaches this needs to have experienced all these human things himself. A teaching thus only reaches its goal and is successful if he who delivers it is acquainted with what he is rejecting. He thereby shows that he himself is able to handle them in an appropriate way.