Ecclesiastes 8:6 states, Because to every purpose there is time and judgment, therefore the misery of man is great upon him.  We must always realize that everything we do is done at a certain time in life and is subject to the judgment of God.  When we realize this, that can lead to misery if we are not living by God's will.  That would be my understanding of what Solomon meant in this verse.  Matthew Henry says that good and bad are both preordained by God.  Again I will never believe that God is the author of evil.  Many religions do see their god, or gods, just arbitrarily sending evil into a person's life simply for their own amusement.  If we believe that God is responsible for everything that happens in the world, then we need not attempt to determine what we should do, because whatever we decide will always be God's responsibility.  That being the case, how could God in all fairness ever condemn a sinner, since God would be responsible for their actions.  This is one of the main reasons I believe that the free will of man is responsible for the evil in the world.  Verse seven says, For he knoweth not that which shall be: for who can tell him when it shall be?  Solomon said there was no way to know the future.  People today seek out horoscopes and seers to tell them what the future holds, but God tells us, as His followers, that we are not to be concerned with the future.  Our future, as His followers, is in His hands, and that is all we need to be concerned with.  As I have said before, I believe this means we are not to be concerned with pinning down the time of the Second Coming, but are only to be ready when it does come.  This really isn't a reward for those who have accepted Christ, but a judgment for those who haven't.  As we get older, as followers of Christ, we get ever so much closer to being with God forever, so we do not need to worry about our destination.  We do, however, need to be concerned with the everlasting fate of the lost and be utilizing our time reaching them.  The future here on earth is not something we can know, but we can be sure that God is in control.