Milk spilt on a stone (2017)

WE that have done and thought,

That have thought and done,

Must ramble, and thin out

Like milk spilt on a stone.

W.B. Yeats “Spilt Milk “

The expression “spilt milk” refers to a mistake that cannot be rectified.
Once a liquid is spilled, it follows its own course, spreads, forks and continues to advance without return until it disperses and disappears, absorbed by other materials. It is irreversible, irretrievable.