In principle, we know that the past is no longer there. That's only a film, a picture of the past. But every time the film is projected, we suffer again. That is why it is very important to learn how to get out of the past, how to come out to the present moment. And you have to come home to store (consciousness?) and rescue the child and bring her or bring him to the present moment. Very important.
You could talk to him or her, "Dear one, I know you are still there alive. You don't have to suffer anymore because you have grown up. I am talking to you as your adult self. I know that the past has already gone. And you should also know that. We have grown up into adults. We are no longer without a defense. We are grownups and we do have a capacity to protect ourselves. We can very well protect ourselves and even call the police."
First when you were born as a child, your fear was born at the same time with you. During the nine months in the womb of our mother, we felt safe. We didn't have to do anything. It was so comfortable. But when we were born, the situation changed drastically. They cut down umbilical cord. And now you have to learn how to breathe for yourself. There was some liquid in your lungs. You had to get that liquid out in order to breathe, to make your first in-breath. So, it's a very dangerous moment. You survive or not depends on that moment. So, you were fearful. Your original fear. And you want to survive. (Our fear might have been born because we were not accepted by our parents unconditionally in babyhood. We need to look deeply into our fear and to understand the root cause to transform it to compassion and peace.)
(to be continued)
(Notes) The descriptions in the parenthesis are my commentaries.