It is this forgetfulness that makes us commit what we call sinful action. If you are insulted by another person, and you become angry in response, the sin is the anger which you create not the insult. You are asleep to the truth that you just hurt yourself, and that you are the creator of your anger not the other person. And now you have a recording in your consciousness that contains an image of the other surrounded by the energy of anger. You put it there, not them. Next time you see them, up comes the anger again, and in that moment you are at your least effective, paralysed by self created anger, you are effectively out of the game until you cool down.
Interesting, isn't it? Never get angry, at anything, or anyone, anytime. It's a sin!