Now playing at the Walter Kerr Theatre on Broadway.

The philosopher Bertrand Russell once said, "The whole problem with the world is that fools and fanatics are always so certain of themselves and wiser people so full of doubts." I love that line. I think it has a great deal of truth to it, but it is incomplete. Someone overwhelmed by doubt cannot act, and sometimes circumstances demand action, even if the best path is not apparent.

John Patrick Shanley's play Doubt grapples with that: the morality of acting decisively in a painfully uncertain world. It's a beautifully crafted work, perfect in its ambiguity; when the actors come to take their bows, we still don't know for sure whether the characters acted rightly. We don't know what the truth is. We, too, have doubts.