I believe there's a term in psychology : self actualisation whereby an individual tries to realise his/her potential or capacities as a human being. Dreams are wonderful to have but if I dream of becoming a singer and I am tone deaf, I may never achieve the dream ( I am truly describing myself here!) After having lived for almost a third of a century, I am content to know that there are things that I can never do and there are some that I am good at which I can still work on to become excellent and I am not just referring to work. I wish to become an excellent teacher, mother and human being. Then I'll die happy. Hence, before a man dies, he needs to know himself very well and realise his potential to the fullest.