One of the major dilemmas that the Preacher has realized is that, after a life of hard work, you have to hand over the results to someone else. What you have done and accomplished with great dedication and wisdom, you will have to entrust to someone else. You never know how the other person will deal with it.
19 Et qui sait s'il sera sage ou insensé? Cependant il sera maître de tout mon travail, de tout le fruit de ma sagesse sous le soleil. C'est encore là une vanité.