Memories can be falsified. As time goes on, your memories will fade and you'll remember things in a deviated & distorted way, probably even different from how they actually happened, or the most dangerous one, remember events that did not take place at all. To stay protected from false memories, write down your predictions, thoughts and feelings the very moment the events are taking place, instead of simply trusting one's memories, because for a normal human mind, memories can be very deceptive.