The famous philosopher known for the quote, "The only thing we have to fear is fear itself," is Franklin D. Roosevelt. He delivered this line during his inaugural address on March 4, 1933, as he sought to reassure the American public during the Great Depression. His rhetoric was aimed at instilling confidence and encouraging action in the face of economic turmoil. Roosevelt's message highlighted the psychological component of overcoming adversity and underscored his commitment to implement policies that would help to restore the nation's economy.