Ludwig Wittgenstein (1889–1951), Austrian philosopher. Notebooks 1914-1916, entry for Sept. 2, 1915, ed. Anscombe (1961).
Wittgenstein reformulated this idea in Tractatus Logico- Philosophicus sct. 5: 641 (1921, trans. 1922): "The philosophical self is not the human being, not the human body, or the human soul with which psychology deals, but rather the metaphysical subject, the limit of the world—not a part of it."