 Coherentism has traditionally been propounded as a doxastic theory: one that holds that only beliefs can serve as evidence. This is in part because one of the major motivations for coherentism derives from an argument due to Wilfrid Sellars (1956), Donald Davidson (1986) and Laurence BonJour (1980) that purports to show that nondoxastic states (e.g., experiences) cannot play an evidential role (about which, more below, in  section 3.4.1).  This doxasticism is the source of one of the most notorious problems for coherentism, however, for the internal coherence of a belief system could result from the ingenuity of the believer, rather than from its fit with reality. A detailed enough and cleverly constructed fairy tale could be highly internally coherent, but surely I am not justified in believing the fairy tale, in my current situation and environment. This is the famous isolation objection to coherentism: a belief system could be isolated from the world and yet be fully coherent. Since those beliefs would not be justified, coherence is not sufficient for justification.