John Wesley on Ecclesiastes 6:12

Who knoweth - No man certainly knows what is better for him here, whether to be high or low, rich or poor. Vain life - Life itself is a vain and uncertain thing, and therefore all things which depend on it must be so too. While - While it abides, hath nothing solid, or substantial in it, and which speedily passes away, and leaves no sign behind it. For - And as no man can be happy with these things while he lives, so he can have no content in leaving them to others, because he knows not either who shall possess them, or how the future owners will use or abuse them.