Imagine you live in a house where the smoke alarm triggered 10 years ago for a fire that was put out that night. However, the alarm has continued to ring incredibly loudly 24 hours a day 7 days a week ever since.
You cannot throw the alarm away or take the batteries out because that would put you at the risk of serious injury or death, and so would muffling the sound with a pillow. So you can’t live with this alarm, but you also cannot live without it!
Have you ever thought that whilst it keeps ringing loudly, it will not alert you if a new fire has started in the vicinity? Or that eventually it will need to ring evermore louder so that you are still aware of it and alert?
So imagine now that someone invents a reset button. It is simple to operate all you do is press it once and it tells the alarm that the fire it warned us about is out, and it can now look out for new fires. The first fire may have caused irreparable damage but that is not the concern of the smoke alarm, it is programmed so that the smell of charcoal does not falsely trigger it. Its only job is to alert us to present danger only as and when it happens.
Old pain is like an alarm, it carries on telling you a message that you acted on a long time ago. If there is no need to remind you then you can safely have it reset.