I've noticed that whenever someone confidently argues for a view I don't at that time share, my own conviction in my opposition wavers. Even perspectives I've held for years, that should be foundational to me, are susceptible to such shakings-up, making me wonder if I really believe in anything at all. I can spend dozens of hours in my mind weaving airtight defenses of my views, but none of that amounts to anything when my belief in those views crumbles at the slightest touch, causing me to retreat into epistemic nihilism (y'can't uproot my beliefs if I don't plant myself in any, but that's a vicious positive feedback cycle of psychic disorder). I'm wondering if this is common in other borderlines. 