The relationship among age, education, gender, syllogistic reasoning s
kill, epistemic beliefs, and moral reasoning in adults was examined. I
t was predicted that five epistemic dimensions would explain unique va
riance in moral reasoning over and above all other variables. This hyp
othesis was confirmed. Beliefs corresponding to simple knowledge, cert
ain knowledge, omniscient authority, and quick learning each explained
the significant variation in performance on the Defining Issues Test
(Rest, 1979). Results showed that multiple epistemic assumptions play
an important role in young adults' moral reasoning over and above othe
r social and personal variables. Implications concerning the developme
nt of epistemic beliefs are discussed.