As we think about the increasing numbers of people suffering dementia, a key question has been raised, and it flows out of this Bible verse in Romans 10.
How, then, can they call on the one they have not believed in? And how can they believe in the one of whom they have not heard? And how can they hear without someone preaching to them?
The question is 'Will God remember me when I forget him?'
To wrestle with that issue, on the line is Professor John Swinton, from the University of Aberdeen.