What is the main content of the eighth lesson of Chinese in the second volume of the first day of junior high school? What emotion does the author express?

In this paper, the author compares the process of national life to a running river, and compares the historical road encountered by the Chinese nation to a rugged and dangerous road, telling us not to be discouraged in difficulties and hardships, to maintain the belief that the revolution will win, and to be heroic. The full text reveals revolutionary optimism and strong patriotism.