Let suppose god has given you abilities of becoming a doctor…but when you went into college you realized you don’t want to become doctor……because you can’t study the subjects which are taught in college and it is compulsory to pass them to become doctor…not because you can’t clear them.you know if you put efforts you can clear them..but you don’t want to put that efforts to clear them..because that subjects are not of your interest…you are not able to study them because that subject don’t interest you at all…can then person change his profession…and start his own buisness because he has so much interest in doing buisness