epistemology

Abstract
The humanities have some foundations. One of them is epistemology. It is a branch of philosophy which is going to be discussed from the perspective of Ayatollah Khamenei. So, in this article some questions should be answered: what is epistemology? Why  is it very important? What is the history of epistemology? What is the main issue of epistemology? What the Ayatollah Khamenei talks about the epistemology?