With this metaphor, Ali highlights how minor annoyances can hinder even the most ambitious journeys. The 'mountains' symbolize our goals and challenges, which we often prepare for mentally and physically. However, it's the small, overlooked issues—the 'pebble in your shoe'—that can cause the most discomfort and distraction. Ali's insight teaches us to pay attention to the little things that might impede our progress. By addressing these minor setbacks promptly, we conserve energy and focus for the mountains that truly matter.