They are sad because they are captured in the prison of their personal history. These days people believe in the same old thing that it is very important to have a plan in life. They never consider the fact if the plan was solely theirs or was devised by some other person.
All they do is keep accumulating on memories, experiences and other people’s ideas which is more than they can cope with and this is why they forget their dreams.
Shades_Of_Life 