Su Shi's poem about Shuiyue Man: The dead are like this, but they have never gone; the ones who are full and weak are like that, but the dead are not waxing and waning.
Su Shi used river water and the bright moon as metaphors.
If you look at things from the perspective of change, the existence of heaven and earth only lasts for a moment; if you look at it from the perspective of change, then things and human beings are endless, so why envy the rivers, the bright moon and the heaven and earth! Naturally, there is no need to "sorrow for a moment of my life"!