As the first monograph to specifically focus on the positive evaluation of belief (doxa) as a crucial concept in Plato’s epistemology, this work contributes significantly to scholarly research by offering a fresh perspective that deepens our understanding of Plato’s theory of knowledge. It shows that doxa is indispensable to the acquisition of knowledge in the human life, thus disproving the long-held notion that Plato was a mere idealist in this respect. The author examines the nuanced, multifaceted role of belief in a well-chosen selection of Platonic dialogues (Meno, Republic, Theaetetus, Philebus, and Timaeus), challenging traditional as well as modern interpretations by letting belief step out of the shadow of knowledge. By offering detailed analyses of relevant arguments, engaging with previous research and providing an innovative interpretation, it is shown that doxa is not only a central but a highly versatile concept in Plato. This study appeals especially to scholars of ancient philosophy and epistemology as well as to all students of philosophy interested in Plato and epistemology.