Backward to the finite

Once upon a time I believed that anything was possible (within reason of course,) but through the years I have learned that there is a finite point. 

A point beyond which it is impossible to go back no matter how much I understand, or forgive, or love.

I don't get to decide this point and that is crazy! How can I have to follow something that comes from inside of me?

There is an ugly saying, "You can't beat a dead horse." Only you can, it just doesn't mean you should expect the horse to do anything new. It is dead, gone, kaput. It will not get back up, or neigh, or even twitch.

Feelings can be the same way.

Once the key turns far enough, there is no going back.

This is just the way things are.