Full Idea
The Ego is an object that appears only to reflection, and is thereby radically cut off from the World.
Gist of Idea
The Ego only appears to reflection, so it is cut off from the World
Source
Jean-Paul Sartre (Transcendence of the Ego [1937], II (D))
Book Reference
Sartre,Jean-Paul: 'The Transcendence of the Ego' [Routledge 2004], p.36
A Reaction
This is the culmination of Sartre's attack (in 1937) on the Ego, paving the way for the freedom of existentialism. Personally I don't accept this picture of the Ego as a second-order fiction. My Ego is part of my relationship with the World.