Abstract
This article is about self-knowledge on one's own mental states. Considering human as rational beings, this study aims to problematize the position of subject in process of self-knowledge, as well as to realize the state of knowledge about self-knowledge. In this way, Richard Moran constitutes the method of transparency about the knowledge of one's own mental states. Such a method receives some criticism from the philosopher Quassim Cassam and the philosopher Brie-Gertler. In the same extent, both authors problematize some characteristics of self-knowledge, in which criticism reaches some points studied by Brazilian philosophers, namely Paulo Farias, Waldomiro Silva Filho and André Abath. The latter two authors are based on Moran's methodology and thus constitute his reflections on conditions of daily life as well as the incomplete understanding of human beings.