In 1:12-6:9, Solomon demonstrated that all work is ultimately futile for two reasons. It does not yield anything really permanent under the sun. Moreover we can never be sure we will enjoy the fruits of our labor before we die. In 6:10-11:6 he pointed out that we can never be sure which of our efforts will succeed because we do not know God's plans or what the future holds. In 11:7-12:14 he emphasized how to live acceptably before God in view of these realities.
"The Teacher has discussed how we should act in view of the uncertainties of life. We must recognize the certainties but must plan in such a way as not to be thrown off balance when the unexpected happens. Now the Teacher goes on to speak of the certainty of growing up and growing old."74