‘Who are you to tell me what to believe?’ replies the zealot. It is a misguided challenge: it implies that certifying one’s beliefs is a matter of someone’s authority. It ignores the role of reality. Believing has what philosophers call a ‘mind-to-world direction of fit’. Our beliefs are intended to reflect the real world – and it is on this point that beliefs can go haywire. There are irresponsible beliefs; more precisely, there are beliefs that are acquired and retained in an irresponsible way.