2:3 I thought deeply about the effects of indulging myself with wine
(all the while my mind was guiding me with wisdom)
and the effects of behaving foolishly,
so that I might discover what is profitable
for people to do on earth during the few days of their lives.
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.