I have thought since about how precisely Mark had understood us both.

He had known his mother well enough to know that she would need permission to be angry — that her grief would come out sideways, as fury, as blame, and that unless someone she trusted told her it was allowed, she would either swallow it until it poisoned her or aim it at the nearest living target, which would have been me.

And he had known me well enough to know that I would need the opposite: permission to move forward without guilt, to honor his wishes without feeling I had betrayed his mother, to hold his choice steady without being made to feel cruel for it.

Two people, two entirely different needs, and he had met both, in a single letter, written in his dying weeks, timed to arrive when each of us needed it.

That is a kind of knowing that only comes from love, and only from a great deal of it.

To see the people you are leaving so clearly that you can hand each of them, in advance, the exact thing that will let them survive losing you — that is not a small final act.