" That first mode is the en-soi (ahn-swah), while the latter is pour-soi (poo-swah), the latter of which roughly corresponds to the existence of human consciousness.
One mode of the title entity of this work is characterized as "de trop," or "superfluous for all eternity." The other mode is derived from the former through the process of neantisation, or nihilation, that causes it to lie "coiled in the heart of [the first title term]Â—like a worm." That first mode is the en-soi (ahn-swah), while the latter is pour-soi (poo-swah), the latter of which roughly corresponds to the existence of human consciousness. This work includes the famous formulation that man is "condemned to be free," and its second chapter examines a type of self-deception the author terms mauvais foi (mow-vay fwah), or bad faith. For 10 points, name this 1943 "Phenomenological Essay on Ontolog" by Jean-Paul Sartre. 
One mode of the title entity of this work is characterized as "de trop," or "superfluous for all eternity.
Being and Nothingness or Le Etre et le Neant [subtitle: An Essay on Phenomenological Ontology] 