It is surprising, how I see people undervaluing themselves immensely, every single day. There are few, and I mean really few who understand their own worth beyond the periphery of immediate friends, family and work. And this negates their ability to contribute positively to the world. An average 25 year old for example, will think about his or her standing at the workplace and friends & family, and those are the only places they believe they have any impact on, or are in anyway responsible for. And that is the greatest reason, I believe that people do not reach their potential, because they do not expand their horizons about their reach.