Literature Reference: Today repeats today, how few are the todays! If today we do nothing, when will this matter end? In a life of a hundred years, how many todays are there? If we do nothing today, it is truly a pity! If we say we'll wait until tomorrow, tomorrow will have its own affairs. For you, I write the 'Song of Today,' urging you to start striving from today. Source from 'Jin Ri Ge'.