Epistemology has nothing to do with
understanding, which is a discipline known as
hermeneutics, which has its origins in the
study, and
comprehension of
scripture.
If you think of knowledge as a telephone book, and epistemology as the study of how we make and use such a thing; then you know epistemology. If you think of understanding as an intimate conversation with your lover, then you understand the difference between the two--as much as we can know anything.