 The trouble is that  \((\NB_1)\)  implies that \(S\) ought to believe everything that is true, an impossible task. This difficulty, it has been argued, is not solved by appealing to a wide-scope reading of “ought” since there are values of \(p\) that are such that \(S\) could neither bring it about that \(p\) is false, nor bring it about that she believes \(p\) (Bykvist &amp; Hattiangadi 2007:  284).[45]  The most common reaction, instead, is to weaken the norm (Boghossian 2003: 37):