To accept the pain is not to put up with abuse. One first has to protect oneself by seeking justice from abuse. To accept the pain is not to live with this pain for the rest of one’s life. To accept the pain is to stand with that pain, to not run from that pain (because the injustice did happen). To accept the pain is to make a commitment not to pass that pain back to the one who offended or to anyone else. As one stands this way and commits to not passing the pain to others, the paradox is that the one who accepts the pain begins to notice that, over time, the pain begins to lessen.
For additional information, see the Four Phases of Forgiveness.