The study of history is the best medicine for a sick mind.

This line is commonly presented as a general maxim about the value of historical study, suggesting that engaging with the past can steady or correct one’s thinking when it becomes distorted by anxiety, obsession, or narrow perspective.

The quote frames history as a kind of mental remedy: by seeing how other people and societies faced change, error, and recovery, a person can regain proportion, humility, and emotional balance.