Derek Parfit's view on personal identity emphasizes that identity is not a fixed essence but rather a dynamic process. He argues that our identity is constantly changing due to the continuous regeneration of cells and the exchange of atoms, leading to the conclusion that personal identity is not as stable as it seems. This perspective can be understood in two ways: the objective reality of identity, which acknowledges the physical changes over time, and the subjective experience of identity, which is shaped by personal perception and memory. Critics of Parfit's view point out potential flaws, such as the challenge of reconciling the fluidity of identity with the need for a consistent self-concept, raising questions about the implications for moral responsibility and personal continuity.
