I have occasionally found it worthwhile to place faith in people whom I do not trust.
That is, someone whom I know is end-of-the-rope broke offers me a promise like, "I will gladly pay you Tuesday for a hamburger today."
Do I really expect to be paid tuesday? I figure, maybe, it's about 40% likely. At best.
Do I really want this guy to go hungry? Nope. Will he accept the burger as charity without the self-respect and dignity of intending to pay? Nope. So I accept his promise. I hand him the burger on faith, thinking of it as just plain altruism or being nice to people.
But then on Tuesday he actually comes around and pays, and he remembers a good turn, and when he's employed again and back on his feet, we go out for a pizza together. A little bit of faith, and suddenly I've made a friend who'll turn around and do the same for me if and when I need help.