Ecclesiastes 2:19
And who knoweth whether he shall be a wise man or a fool? yet shall he have rule over all my labour wherein I have laboured, and wherein I have shewed myself wise under the sun. This is also vanity.
And who knoweth whether he shall be a wise man or a fool?.... The king that should be after him, as the Targum, that should be his successor and heir; and so whether he would make a good or bad use of what was left; whether he would keep and improve it, or squander it away; suggesting, that could he be sure he would be a wise man that should come into his labours, it would be some satisfaction to him that he had laboured, and such a man should have the benefit of it; but as it was a precarious thing what he would be, he could take no pleasure in reviewing his labours he was about to leave. Some think that Solomon here gives a hint of the suspicion he had, that his son Rehoboam, his successor and heir, would turn out a foolish man, as he did;
yet shall he have rule over all my labour wherein I have laboured, and wherein I have showed myself wise, under the sun; be he what he will, all will come into his hands; and he will have the power of disposing of all at his pleasure; not only of enjoying it, but of changing and altering things; and perhaps greatly for the worse, if he does not entirely destroy what has been wrought with so much care and industry, toil and labour, wisdom and prudence; the thought of all which was afflicting and distressing: and therefore he adds,
This is also vanity; and shows there is no happiness in all that a man does, has, or enjoys; and this circumstance, before related, adds to his vexation and unhappiness.