Any time we claim certainty on a given issue, we claim omniscience as to that issue. A sense of certainty is one of the strongest signs that some, perhaps important, things are being overlooked. Recognition of uncertainty is one of the most solid, dependable assumptions underlying the American system of politics. It’s the assumption that anyone can be wrong—and that everyone can be wrong. That assumption is a safeguard and a reminder that certainty should be handled with care and grounded in humility.