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Singer emphasizes that while it’s nearly impossible to control the external world, individuals can attain mastery over their inner landscapes. He illustrates this idea with the metaphor of a thorn stuck in one's arm. Most people tend to adapt their lives to avoid pain, much like adjusting daily activities to prevent emotional discomfort.
Instead, Singer encourages readers to "pull out the thorn," which symbolizes confronting and allowing negative emotions to surface, rather than suppressing them. Suppressing emotions leads to blockages that can resurface later, often causing greater distress. Acceptance of one's emotions and understanding their sources can facilitate healing, allowing individuals to navigate life's challenges without the burden of unresolved feelings.