Two-Spirits, an umbrella term sometimes used for what was once commonly known as berdaches
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Beyond: Two Souls, an interactive drama action-adventure video game
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Two Souls in One, a debut album by American saxophonist George Braith recorded in 1963
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The Two Souls of Socialism, a socialist pamphlet that posits a fundamental division in socialist thought and action
All Souls College, Oxford | The Bouncing Souls | All Souls College | Sea of Souls | All Souls' Day | All Souls Church, Langham Place | The Souls of Black Folk | Souls to Deny | Souls for Sale | Paladin of Souls | Carnival of Souls | Beyond: Two Souls | The Lake of Souls | Silent Souls | Shivers II: Harvest of Souls | Nightworld: Lost Souls | Lost Souls | Foyle's War Series Six#"Broken Souls" | Dark Souls | Chorus of Souls | All Souls | Two Souls in One | Those Bastard Souls | The Two Souls of Socialism | The Mirror of Simple Souls | the Mirror of Simple Souls | Souls Protest | Souls of Mischief | Lost Souls (film) | Earth 2150: Lost Souls |
The episode's title is taken from a line in the Dylan Thomas poem Ballad of the Long-legged Bait, which was first published in 1946's Deaths and Entrances; while the quotation displayed at the beginning—"Two souls, alas, are housed within my breast"—is taken from Goethe's Faust, a two-part 19th century play by Johann Wolfgang von Goethe.