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High Quality Content by WIKIPEDIA articles! The philosophy of self defines the essential qualities that make one person distinct from all others. There have been numerous approaches to defining these qualities. The self is the idea of a unified being which is the source of consciousness. Moreover, this self is the agent responsible for the thoughts and actions of an individual to which they are ascribed. It is a substance, which therefore endures through time; thus, the thoughts and actions at different moments may pertain to the same self. As the notion of subject, the self had been harshly criticized by Nietzsche at the end of the 19th century, on behalf of what Gilles Deleuze would call a "becoming-other".