“In every friendship hearts grow and entwine themselves together, so that the two hearts seem to make only one heart with only a common thought. That is why separation is so painful; it is not so much two hearts separating, but one being torn asunder.”

First Week, Sixth Day. Compare: "Two friends, two bodies with one soul inspir'd", Alexander Pope, The Iliad of Homer, Book xvi, line 267.
La Semaine; ou, Création du monde (1578)

Deux estions et n’avions qu'ung cuer.
Alternative translation: We were two and had but one heart between us.
Source: Le Grand Testament (The Great Testament) (1461), Line 986; "Lay".

Source: First Among Sequels

1977

Zwei Seelen und ein Gedanke,
Zwei Herzen und ein Schlag.
Der Sohn der Wildnis (1842), Act ii (published in English as Ingomar the Barbarian; translation by Maria Lovell), reported in Bartlett's Familiar Quotations, 10th ed. (1919). Compare: "Two friends, two bodies with one soul inspir’d", Alexander Pope, The Iliad of Homer, Book xvi, line 267.; "’T was then we luvit ilk ither weel, ’T was then we twa did part: Sweet time—sad time! twa bairns at scule— Twa bairns and but ae heart", William Motherwell, Jeannie Morrison (c. 1832), Stanza 3.

Source: Inkdeath

Sacrifice
Song lyrics, Sleeping with the Past (1989)

Source: Gone with the Wind