There is a scene in the movie Indiana Jones and the Last Crusade where Harrison Ford is standing on the edge of a rocky abyss. His path leading to the Holy Grail continues on the other side, but he can see no bridge.
“Impossible, nobody can jump this,” he exclaims. “It’s a leap of faith.”
The camera cuts away to Sean Connery, playing Jones Senior, who urges “You must believe boy, you must believe”.