Abstract: This chapter examines the Stoics’ views on belief and knowledge. Stoics define belief as an assent of an impression. There are different kinds of beliefs; the most important ones follow from the fact that there are different kinds of assent, and different kinds of impressions to assent to. Stoics identify a special class impressions — called kataleptic impressions — that have a certain sort of vivid clarity, fidelity, and reliability. A kataleptic impression is one that comes from what is, is stamped and sealed and moulded in accordance with what is, and is of such as sort that it could not come from what is not. Knowledge is defined as a strong assent to a kataleptic impression.

Keywords: belief, knowledge, impressions, assent, Stoicism, philosophy, Stoics, kataleptic impression,