Why does the author say compared to him the mouse is blessed in To a Mouse?

In "To a Mouse," the author Robert Burns suggests that the mouse is "blessed" compared to humans because it lives in the present and is free from the burdens of past regrets and future anxieties. While the mouse focuses on survival and its immediate needs, humans often grApple with the complexities of life, including worries about what has been lost or what may come. This contrast highlights the simplicity and contentment of the mouse's existence, emphasizing the author's sympathy for both the mouse and human struggles.