In these verses there is a direction to for get the former things and not to dwell on the past.
18. Remember you not the former things. Neither consider the things of old.
19. Behold i will do a new thing, now it shall spring forth and you will not know it. I will even make a way in the wilderness and rivers in the desert. NKV
One of our failings is to start going into the past. Be it ours or an others When we are saved God has done a new thing in our hearts and minds We are moving forward into a new life in him. Things should never look the same. We also have a new way of thinking.
That being the case, then we should not be thinking about situations and failures and mistakes we have made. That is a way to rob ourselves of our joy we find in our new life. People will remember us as we were and will talk to us about our past. Particularly if it is somebody we have upset or done wrong to.
They have to see that we have changed and to think i like what i see and hear. I would like to have some of that. That is our witness to the world, to see a lightness and a joy we have obtained. Do you think that Jesus said. Well i am only a carpenters son but i will try to help you.
The only people who would not recognize the change in him. Were people from his home town. They wanted to throw him over a cliff for daring to say who he was. They said this is the son of Joseph who we know well. They could not and would not see the change. The worst people to convince are often your own family.
Why? because they remember the former things and that is who we are in their eyes.