What was the purpose of Franklin D Roosevelt’s speech?

 To provide a precise answer, it would be helpful to know which of Franklin D. Roosevelt's speeches you are referring to, as he delivered many over the course of his political career, including his four terms as the President of the United States. However, his most famous speech is likely the inaugural address given on March 4, 1933, during the Great Depression.

The purpose of Franklin D. Roosevelt's 1933 inaugural speech was to reassure the American public and to outline his approach to addressing the Great Depression. He sought to instill confidence and hope in a nation battered by economic hardship, bank failures, and high unemployment. One of the most famous lines from this speech is, "the only thing we have to fear is...fear itself," emphasizing his belief that fear was worsening the economic crisis.

In this speech, Roosevelt presented his New Deal policy that aimed to provide relief, recovery, and reform to the United States' economy and society. He spoke of the necessity for direct, vigorous action to combat the Great Depression and outlined his plans for putting Americans back to work, regulating the banks and financial institutions to prevent future crashes, and providing aid to those in need.