„What is a friend? A single soul dwelling in two bodies.“

— Aristotle

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„As a body everyone is single, as a soul never.“
— Hermann Hesse
„Two souls with but a single thought,Two hearts that beat as one!“
— John Keats
„Body and soul are not two different things, but only two different ways of perceiving the same thing.“
— Albert Einstein
„One ever feels his twoness, -- an American, a Negro; two souls, two thoughts, two unreconciled strivings; two warring ideals in one dark body, whose strenth alone keeps it from being torn asunder.“
— W.E.B. Du Bois