There can be a number of reasons why intelligent people fail to achieve their potential. In some cases, it may be due to a lack of motivation or drive. Others may lack the necessary skills or knowledge to succeed. And in some cases, it may simply be because they don’t believe in themselves. Whatever the reason, it’s important to remember that everyone has the potential to succeed if they put their mind to it. It’s just up to each individual to decide whether or not they’re going to make the most of their abilities.