Abstract

: This article addresses the fact of possible and impossible determination of the I or the self-reflective I. In this context, two questions in particular are discussed: What epistemic functions of the I can be legitimately identified, and what kinds of determination of the I are invalid? A theoretical proof of the immortality of a single, persistent substance of the soul is not possible, because no material substance that corresponds to the I can be found or determined. As this article shows, however, at least a specific form of knowledge of the I, with a view to Kant’s unity of apperception and its actions, can be observed and is therefore epistemically justified.