This alone I have learnt - God made us plain and simple, but we have made ourselves very complicated. (GNB Ecclesiastes 7v 29)
Animals are quite content to simply be themselves, but we humans are always looking for more, or other, than we find ourselves to be. We search our souls for meaning, shop the world for our pleasure, try this and try that to "find ourselves" - the harder we try the less we seem to "find!" In the end, all we are trying to find is our simple humanity and its meaning. Ecclesiastes is about someone trying to find the "meaning of life", as those Monty Python boys put it!
The last and final word in this book is this "Fear (Respect) God, and do what he tells you". That's it - the meaning of life! Until we realise that life really is this simple, we will keep struggling in our endeavours for "enlightenment". Jesus came into this world to show us this truth. God wants to know you, He wants to communicate with you and longs for you to listen to Him, so that He can fill your life with good things. It really is that simple. There is nothing else to discover.