Hi Peter,
I think Chris would tell you, as he did me in this post from a while back:
http://forums.screenplay.com/viewtopic.php?f=21&t=1958that "forgiveness" is a thematic subject, and can be approached from any of the thousands of storyforms in the way that best suits your purpose. Since Dramatica does not force you to approach your storyform from the top down (i.e., the high level themes, goals, etc), I often start answering questions at lower levels or in other areas, such as getting some of the elements of my MC and IC defined. Those may change down the road, but as you define these things the software will also begin to whittle down the list of high level choices, which may help you focus in on the right ones.
One thing you may want to do to get the higher level ball rolling, however, is to pick a single item: Concern, which will also narrow your choices at the lower levels. An obvious Concern for a story dealing with forgiveness, for example, would be "The Past". But it could also be "The Present" (how is a lack of forgiveness [either giving or getting] affecting us now?) or "The Future" (how will forgiveness affect us down the road?) or "Changing One's Nature" (movement from being unforgiving toward being forgiving, or vice versa), or Memories, or Obtaining, or in fact any of the Concern items available.
Which of these you choose will "weight" the storyform that emerges in that direction.
Jeff