This sentence came from the Tang Dynasty poet Li Qi's "Song of Tomorrow." The full text was as follows: Tomorrow and tomorrow, how many more. I live to wait for tomorrow, and everything will be wasted. If the people of the world wait until tomorrow, spring will go and autumn will come. Since ancient times, everything has been like this. People are always tired of tomorrow. Spring goes, autumn comes, old generals come, and in the end, they regret it endlessly. So don't wait for tomorrow, don't let your future self regret it. Cherish the present and grasp the present.