Full Idea
One epistemically ought to have the doxastic attitudes that fit one's evidence. Being epistemically obligatory is equivalent to being epistemically justified.
Gist of Idea
Beliefs should fit evidence, and if you ought to believe it, then you are justified
Source
R Feldman / E Conee (Evidentialism [1985], III)
Book Reference
'Epistemology - An Anthology', ed/tr. Sosa,E. /Kim,J. [Blackwell 2000], p.172
A Reaction
It is normal for someone to refuse to accept something, when another person believes the evidence is overwhelming. Evaluation of evidence must include an assessment of what other evidence might turn up.