This passage is about the relentless predictability of life. We see the wonderful way the word of God belittles the idea that you can trust in all human wonders and achievements.
The preacher can amplify these pictures and show the mechanistic inevitability of our experience without life in the soul. You would never preach a sermon that was all illustrations. In using this passage, the preacher is required to do a kind of upside-down technique of exegesis, and turn the illustrations into principles of truth. If you live without God what is life worth? The sun does the same thing every day, from a human point of view. Indulge in a little gloomy thinking. How do we describe these cycles? Something ascending – childhood, growth, success? No, it is something that is going nowhere – we are born, we are cared for as children, we grow and develop as adults, we find work, buy a house, get married, have children of our own, grow old and die. How predictable! What have we accomplished of any lasting value? Like the sun we burst forth over the horizon full of expectancy and hope, only to rush towards our final goal driven by illusions which are doomed to disappoint us. This is a picture of the generations passing, it is a picture of an individual life, and it a picture of the plans and schemes that we devise in our lives. You are trying in a sermon that does not plunge people too low, to show the futility of life. Or ambition and achievement – desire, hard work, promotion, success, pride. How much we are victims to the simple cycles of life. Or a possession – I must have it – I work, I save, I buy, I enjoy, and then I grow bored. Is life really so wonderful? Is it so clever to reject God and focus only on this life? How much the television soaps play on this kind of outlook. Life is as petty and as small as that.