5:18 I have seen personally what is the only beneficial and appropriate course of action for people:
to eat and drink, and find enjoyment in all their hard work on earth
during the few days of their life which God has given them,
for this is their reward.
8:17 then I discerned all that God has done:
No one really comprehends what happens on earth.
Despite all human efforts to discover it, no one can ever grasp it.
Even if a wise person claimed that he understood,
he would not really comprehend it.
11:9 Rejoice, young man, while you are young,
and let your heart cheer you in the days of your youth.
Follow the impulses of your heart and the desires of your eyes,
but know that God will judge your motives and actions.