We'll talk about it in ashes.

The meaning of this sentence is that no matter how beautiful fireworks are, they will eventually turn to ashes, reflecting one's values and sober self-awareness of beautiful things.

This sentence also tells us not to pursue beautiful things too tactfully, because even the best things will eventually disappear. Therefore, things should be measured and measured, and we should do what we can according to our actual situation, so as not to hurt ourselves and go astray.