my friends and I asked the dalai lama around for a cup of tea when he was in New Zealand, alas, he couldn’t make it….
“Although you may have experienced many negative events in the past, with the development of patience and tolerance it is possible to let go of your sense of anger and resentment. If you analyze the situation, you’ll realize that the past is the past, so there is no use in continuing to feel anger and hatred, which do not change the situation but just cause a disturbance within your mind and cause your continued unhappiness. Of course, you may still remember the events. Forgetting and forgiving are two different things. There’s nothing wrong with simply remembering those negative events: if you have a sharp mind, you’ll always remember, he laughed. “I think the Buddha remembered everything. But with the development of patience and tolerance, it’s possible to let go of the negative feelings associated with the events.”
this is from a site about wtc survivors experiences