generation gap, more on KD and son

I guess that there has always been a generation gap. King David and all of his sons, but most of all Shlomo. The beauty of t'hilim is KD's faith in G-d throughout all of his difficulties and how he repeats that there is a reward for hardwork. Kohelet, his son and successor, did not have the same sort of hard work to do. All of the physical and social difficulties that his father went through didn't exist for Shlomo, and he was miserable. Maybe that's why KD wrote "sow in tears and reap in joy." He who had suffered so much could find joy more easily than his son, his privileged son, who suffered from his riches.