What does galarza mean by using the spanish saying about the mule?

Galarza uses the Spanish saying about the mule to illustrate the stubbornness and resilience of individuals facing challenges. The metaphor emphasizes how, much like a mule that refuses to budge, people can be tenacious in their beliefs and actions, even in the face of adversity. This saying encapsulates the idea that determination can be both a strength and a potential obstacle, depending on the context. Ultimately, it highlights the complexity of human nature and the struggles inherent in making progress.