Jeannie Morrison (c. 1832), Stanza 3. Compare: "Zwei Seelen und ein Gedanke, Zwei Herzen und ein Schlag" (translated: "Two souls with but a single thought, Two hearts that beat as one"), Eligius Franz Joseph von Münch-Bellinghausen, Ingomar the Barbarian, Act ii.; " Two friends, two bodies with one soul inspir’d" Alexander Pope, The Iliad of Homer, Book xvi, line 267.https://en.wikiquote.org/wiki/William_Motherwell