John Gill Commentary Ecclesiastes 3:13

"And also that every man should eat and drink, and enjoy good in all his labor, is the gift of God." — Ecclesiastes 3:13 (ASV)

And also that every man should eat and drink Not to excess, but in moderation; and yet freely, plentifully, and cheerfully; and not alone, but giving the poor a portion with him; and in all having in view the glory of God, (1 Corinthians 10:31);

and enjoy the good of all his labour; take the comfort of what he has been labouring for, and not lay it up for, and leave it to, he knows not who: the Targum is, "and see good in his days, and cause his children, at the time of his death, to inherit all his labour;"

it [is] the gift of God; not only to have, but to enjoy, and make a proper use of the mercies of life. This is the same doctrine which is delivered (Ecclesiastes 2:24).