People are complacent. Just doing enough to get by is a way of life for many people. Mediocrity is all that can be expected from just one individual, right? If that were true, we wouldn't have incredible leaders and role models in our world to look up to and admire. Gandhi, Abraham Lincoln, Albert Einstein, Nelson Mandela and many more people stood up and did great things. Every single individual has the ability to be great, not just those who have carved out a place in history. One is never too small to achieve greatness.
Once a person has experienced a healthy level of achievement, they discover that it comes with an incredible feeling of self-fulfillment. It is also when people realize that achievement is something that they made happen and it was not a result of luck.