"I'm not the greatest; I'm the double greatest. Not only do I knock 'em out, I pick the round"

In this quote, Muhammad Ali is revealing his confidence and self-belief in his abilities as a fighter. He declares that he is not just the greatest, but the "double biggest," implying that he is even much better than the very best. He then goes on to discuss that he not just knocks out his challengers, but he likewise has the skill to pick the specific round in which he will do so. This showcases his strategic thinking and proficiency of the sport. Overall, this quote highlights Ali's undeviating confidence and determination to be the best in his field.