'Worthwhile' in the Bible

I thought to myself, "Come now, I will try self-indulgent pleasure to see if it is worthwhile." But I found that it also is futile.

The only worthwhile thing for a human being is to eat, drink, and enjoy life's goodness that he finds in what he accomplishes. This, I observed, is also from the hand of God himself,

I have concluded that the only worthwhile thing for them is to take pleasure in doing good in life;

I concluded that it is worthwhile for people to find joy in their accomplishments, because that is their inheritance, since who can see what will exist after them?