An Auspicious Day (the Bhaddekaratta Sutta) is a beautiful sutta with a poem by the same name at the center of it. In the time of the Buddha, the poem was frequently memorized, recited, and used as a basis for dharma teachings. It’s sometimes seen as the “anthem” of insight (vipassana) practice in the modern world:
Don’t chase the past.
Have no expectations for the future.
The past is left