"I owe them"

Start with the debt, since the guilt claims to come from it.

There's a strand of research on why adult children care for their parents, and it separates two motives that feel like one from the inside. The first is attachment, which is plain affection, the wish to be near someone and see them all right. The second is obligation, the sense of owing, of duty, of what's expected. Cicirelli studied 78 daughters caring for elderly mothers in 1993 and found that both motives were linked to how much help the daughters gave. Attachment and obligation both got people through the door. But they parted company on what the helping felt like. Stronger attachment went with less felt burden. Stronger obligation went with more.

Read that again, because it's the whole book in two sentences. The two motives produce the same amount of care. One of them wears you down and the other doesn't.

A study of 204 working women caring for older relatives, by Clare Lyonette and Lucy Yardley in 2003, found the same shape. They separated what they called extrinsic reasons to care, which included guilt, the older person's expectation of care and fear of what others would think, from intrinsic reasons, which were things like wanting to live up to your own principles and simply being a caring person. The extrinsic reasons, along with a poor relationship with the person cared for, were the strongest predictors of carer stress. The intrinsic reasons predicted satisfaction.

So the debt is real, and you can pay it two ways. You can pay it because you love them, which is attachment, or you can pay it because you owe them, which is obligation, and the research says the second way costs more for the same payment. My interpretation, and I'll mark it as mine, is that guilt is what obligation feels like when it's running the show. It's the debt collector's knock. And the thing about a debt collector is that no amount you hand over makes him stop knocking, because he was never keeping the account.