Many intelligent leaders have failed for the simple reason that they have not been able to resonate with the people they lead.
Relevance is what happens when your thoughts and operations resonate with people.
No matter how intelligent you are, if you are not able to break down your thinking to the point where people can understand it and where it resonates with them then you have not yet found your leadership mojo.
Even if your intelligence has the ability to save the world, if you are not able to communicate it in a way that can be executed, then you risk irrelevance.
Relevance is the process of aligning your senses and operations to present day realities.