Propositional faith and trustworthiness

I argue that propositional faith presupposes trustworthiness, in this sense: faith that p is fitting only if the one in whom you have faith to bring it about that p is trustworthy to bring it about that p. In defence of this, I argue that propositional faith is a species of interpersonal faith and that interpersonal faith presupposes trustworthiness. I also discuss some of the consequences of my thesis for theistic propositional faith.