Advice comes too late when a thing is done.

Guidance offered after an action is complete cannot influence the choice that has already been made or prevent its consequences.

The proverb stresses the value of speaking up while there is still time to act. It does not mean that reflecting afterward can never help with future choices.

Use it in response to a warning or suggestion offered only after the relevant action is complete. It points out that the advice would have been more useful earlier.