Does it good to have a goal in Life ?How to avoid become fool by others?

Goal In Life

when some one tells you that you are fool it's an insult , but when you by your self realise that you are fool that means you are smart enough to know that. Becoming a fool is not a bad thing because everyone is fool ,but if some tells you fool then you realise that you are fool, that is not good .so my point is very simple if you understand my point, no one will able to insult.
You need to realise where you are fool and you need to work on that, do not give others chance to say you are fool . Now if we talk about focusing on a particular life goal , then we need to understand this , suppose you want to eat too many mango , so what you will do for mango, you need 4 things for that ,first Fertile land second a Mango seed 3rd sun light and 4th water. None of them looks like mango still they will produce mango for you. But what if you do not want to do all these things , you will try to theft , you will try to snatch it from some others .In the same way ,what goal you have tomorrow will totally depends upon what kind of data you gathered today . Your goal is just going to be a fanciful desire that you made up in your mind , and that goal is not even yours , your goals are borrowed from 10-12 people . Whatever is trends today that is your goal . I would like to tell all of you , do not set any goal, if you have absolute devotion towards what you are doing today ,depending upon time and opportunity we will go upto the best . But if you are always thinking about finish line or you are always thinking about destination , you will fall .If you will get to the goal you will disappointed ,if you fail to reach your goal you will be broken .     
You want to see Most successful people on the planet ? Just go on the street , leave the people who are driving Maruti , and look at the every one who are driving a BMW and Mercedes , they are successful people , just carefully watch them, how many of them are joyfully driving? you will see hardly any person joyfully driving their dream car. So those who got their goal are disappointed and those who are fail to reach their goal are broken . So i wanted to understand what is use of such kind of goals , why don't we focus on current work , why can't we fully devoted to our work which we are doing now, instead of setting any goal . Tell me ,In any field any arena of life sport , art ,music ,Politics ,Spirituality , business,  have you seen any person reached any significant level of achievement without full devotion. Here devotion does not mean going to temple , devotion towards what you are doing today.. So in summary i would like to say you , you can make some goal for your life but you should not think all the time about finish line ,rather you should enjoy the work what you are doing to achieve your goal.