5 things you can't recover in life; 1) A stone after its thrown. 2) A word after its said. 3) An occasion after its missed. 4) Time after its gone. 5) Trust after its lost.
In life once we do something, there is no taking it back. When we commit to something we must do so with the notion that we will never be able to go back in time and change it. We can learn and grow from the losses and victories of the past, but we can never change them.