work hard to become successful?

Is it really necessary to work hard to become successful or not?
I have seen people who worked very hard and got bankrupt and people who worked with joy and not so hard, with much free time and got rich…
Working hard has nothing to do with success… it is just an Ego trip… We don’t need to suffer in order to get what we want… If I see my father and me, who were working hard and compare it with smart and happy people, I must admit that we both had been stupid. For instance in the firm of my father, all the leading manager 3 had an Doctor title with one exception… This guy had even not a matriculation and made more profit then all the other 4 managers including of my father… He was a funny and happy guy and an awesome salesman… I was with him on vacation and on parties…. Regardless how hard I confronted him, he still remained relaxed and funny… His salary was higher then from every CEO in Germany…. If we enjoy our life then we attract also the better chances and belief me one thing, a salesman has to be always in a good mood…. I remember, we had been on a party, he got drunkard, slept with my sister, next morning he was picked up to a conference and he vomited in the new Mercedes S of the customer, got abused from my father in the conference… still he made it… This means, we take everything too seriously, then we put us under stress, because of our failing and then we loose. When I was hitch hiking in the USA, Canada a Salesman picked me up and told me his life story… He said until I wanted truly to be the best salesman I failed and then when I didn’t care at all, how much I sold, I became the best…. Again also this guy didn’t need to work overtime, … he was focused to enjoy his life. Peace Nobel Price winner and former Chancellor (Prime minister) of Germany Willi Brand, said it very simple, I work only 8 hours and I have free on my weekends…. What I can’t do in the working hours I let for tomorrow … I don’t belief in overworking, it never will work out…