Hobbies and passion are mostly the result of intrinsic motivation.
This form of motivation is long-lasting and self-sustaining.
In case of a student, intrinsic motivation focuses more on the subject rather than punishments or rewards. This helps the student to learn better.
Successful people in work places are often intrinsically motivated. Also, if an individual can be made to believe in an idea, he/she can be intrinsically motivated.