Final answer:
Muhammad Ali's quote emphasizes the impact of small obstacles in our lives.
Step-by-step explanation:
The quote by Muhammad Ali, 'It isn't the mountains ahead to climb that wear you down. It's the pebble in your shoe,' is a metaphorical expression that emphasizes the idea that small problems or obstacles can have a significant impact on our motivation and progress.
Ali uses the imagery of climbing mountains to represent the bigger challenges in life, which may seem daunting but ultimately strengthen us. However, it is the small pebble in our shoe, a seemingly insignificant issue, that becomes a constant source of discomfort and hinders our ability to continue.
This quote serves as a reminder that we should not underestimate the power of small obstacles and disruptions in our lives. Just as a pebble can be a source of irritation during a long journey, we should pay attention to the small things that may hinder our progress and find ways to address them.