Verse eight ended with a time to love and a time to hate, a time of war and a time of peace.  Ecclesiastes 3:9 says, What profit hath he that worketh in that wherein he laboureth?  Solomon was still questioning what we gain by working in this world.  After all the contrasts of the things that life offers, Solomon was again questioning what difference it all made.  Once more Solomon was looking at life from the temporary nature that it has.  If we are labouring simply for material gain, we will find the same to be true.  Only those things done for God have everlasting value. Verse ten says, I have seen the travail, which God hath given to the sons of men to be exercised in it.  God made man to care for the earth, and after the fall, He said man would toil for his living.  We were never intended to just sit back and enjoy the things of the earth, but were created for God to use us for His purpose.  So, if we are living and working outside the will of God, there is no profit in anything we do.  Verse eleven says, He hath made every thing beautiful in his time: also he hath set the world in their heart, so that no man can find out the work that God maketh from the beginning to the end.  Solomon could not understand all the work that God was doing in the world, and neither can we.  We live in this temporary world, and cannot understand all the works of God, but we can rest assured that He is in control and that His works are indeed beautiful.  Verse twelve concludes, I know that there is no good in them, but for a man to rejoice, and to do good in his life.  There really is no good in living simply for the things of this world.  We are called to rejoice in God and do good, which is to follow God's will, in our lives.  That is the only way to true happiness.