Memory is history

Could you ever forget or erase your memory? Having unpleasent past or nonsensicle memory that you dont ever want? Let past be arest. Its something good dont have to feel bad about it, cause you are learning something from it, gained experiences that you have to. Good and bad memory were history, that already happened and you cant do anything about it. Refined and Learn thats the only way out. Thats why we must have our history lesson I guess.