The Buddha says “in order to really have loving kindness, we have to free ourselves from ill will. Let none despise any being in any state”. So this is a instruction… Just for a moment reflecting on how many people you actually despise. That's maybe not the way you think about it, but think of the people you judge, that you resent, that you wouldn't mind if they didn't exist… What does this topic of forgiveness bring up for you?