Encourage People to Transform "I Can't" into "I Can!"
Accomplishments require persistence. When someone is confident in himself and his abilities, there is a chance (but no guarantee) that he will succeed. When he does not believe in future success, his lack of confidence prevents him from acting toward that goal. If he starts to try, he is more likely to give up and quit.
When you encourage someone and you transform his belief about his potential, you have changed that person for the better. He will now be more likely to achieve what he otherwise would not have achieved.