How is last leaf related to the proverb diseased mind harmful than disease itself?

In the short story “The Last Leaf” by O. Henry, the proverb "a diseased mind is more harmful than disease itself" is exemplified through the character of Johnsy, who is suffering from pneumonia. Johnsy's mental state plays a significant role in her physical health, and her belief that she will die when the last leaf falls from a vine outside her window leads to a decline in her condition. The story emphasizes the harmful effects of a negative mindset on one's overall well-being.

The proverb suggests that a diseased mind can have more detrimental consequences than a physical illness. In "The Last Leaf," Johnsy's fear and obsession with the falling leaves become a self-fulfilling prophecy, as she loses hope and her health deteriorates. Her weakened mental state prevents her body from fighting the disease effectively, illustrating the proverb's assertion.

The story also showcases the positive impact that a healthy mindset can have on recovery and healing. Behrman, an elderly artist who lives in the same building, paints a fake leaf on the wall outside Johnsy's window to deceive her into thinking that the last leaf is still there. This act of kindness and the resulting improvement in Johnsy's mental state demonstrate the proverb's converse: a healthy mind can contribute to overcoming illness.

Through the characters of Johnsy and Behrman, the story explores the complex interplay between mental and physical health, highlighting the importance of maintaining a positive outlook during challenging times. "The Last Leaf" serves as a reminder that our mental state can significantly influence our overall well-being, underscoring the truth encapsulated in the proverb.