 BonJour outlines four traditional assumptions about knowledge, understood as roughly justified true belief, which he “broadly” endorses (BonJour 2010: 58–9). First, knowledge is a “valuable and desirable cognitive state” indicative of “full cognitive success”. Any acceptable theory of knowledge must “make sense of” knowledge’s important value. Second, knowledge is “an all or nothing matter, not a matter of degree”. There is no such thing as degrees of knowing: either you know or you don’t. Third, epistemic justification comes in degrees, from weak to strong. Fourth, epistemic justification is essentially tied to “likelihood or probability of truth”, such that the strength of justification covaries with how likely it makes the truth of the belief in question.