What's done is done

What is done cannot be undone.  We can only reflect and learn from the consequences of our actions.

Truth be told, the majority of our actions as we move through our lives are only of import to ourselves.  Probably,  that remark you made so long ago, that still flits through your head at the most inappropriate times, only registered in your own brain.  If our brains retained every sentence that was filtered through our ears for the entirety of our lives, I think that the personal interconnectedness - our collective soul - would be lost.