Jesus starts out by telling His disciples ( and us ) that He gives them ( and us ) something new; He gives them ( yes, and us ) a new commandment. Odd, I thought God never changes. At any rate, Jesus Himself says that this commandment is new.
“A new commandment give I unto you…”
Unlike the old way, we are not to take an eye for an eye or a tooth for a tooth. We are not to retaliate. Rather we are to forgive and yes – forget by loving one another. This other-worldly, beyond-human love is what distinguishes us from the rest of the fallen world. Listen to Jesus tell His disciples ( and us ) the new commandment is:
that ye love one another: as I have loved you, that ye also love one another. By this shall all men know, that ye are my disciples, if ye have love one to another.