What is Doubt? Each of us is like a planet. There’s the crust, which seems eternal. We are confident about who we are. If you ask, we can readily describe our current state. I know my answers to so many questions, as do you. What was your father like? Do you believe in God? Who’s your best friend? What do you want? Your answers are your current topography, seemingly permanent, but deceptively so. Because under that face of easy response, there is another You. And this wordless Being moves just as the instant moves; it presses upward without explanation, fluid and wordless, until the resisting consciousness has no choice but to give way.
It is Doubt (so often experienced initially as weakness) that changes things. When a man feels unsteady, when he falters, when hard-won knowledge evaporates before his eyes, he’s on the verge of growth. The subtle or violent reconciliation of the outer person and the inner core often seems at first like a mistake, like you’ve gone the wrong way and you’re lost. But this is just emotion longing for the familiar. Life happens when the tectonic power of your speechless soul breaks through the dead habits of the mind. Doubt is nothing less than an opportunity to reenter the Present.
Shanley, John Patrick. Doubt (from the preface)