“Two souls alas! dwell in my breast.”

"The Ninth Paradise", p. 223.
Poetry of the Orient, 1865 edition

As quoted in Bismarck: The Man and the Statesman (1955) by A. J. P. Taylor, p. 12. Cf. Goethe, Faust, Part I: Zwei Seelen wohnen, ach! in meiner Brust, / Die eine will sich von der andern trennen ("Two souls, alas! reside within my breast, / and each is eager for a separation").
Faust klagt über die zwei Seelen in seiner Brust; ich beherberge aber eine ganze Menge, die sich zanken. Es geht da zu wie in einer Republik... Das meiste, was sie sagen, teile ich mit. Es sind da aber auch ganze Provinzen, in die ich nie einen andern Menschen werde hineinsehen lassen.
:*Bismarck traveling in an open carriage through the green valley of Hofgastein to Salzburg with Vortragender Rat Robert von Keudell and Geheimrat Heinrich Abeken on 18 August 1865 after the Gastein Convention had been signed on 14 August 1865 (as reported by Keudell). Bismarck: Die gesammelten Werke, Band 7 Gespräche, 1924, p. 101 https://books.google.de/books?id=mMkTAAAAQAAJ&q=seelen
1860s

The Earthly Paradise (1868-70), The Lady of the Land
Context: "Alas, alas! another day gone by,
Another day and no soul come," she said;
"Another year, and still I am not dead!"
And with that word once more her head she raised,
And on the trembling man with great eyes gazed.

1840s, Heroes and Hero-Worship (1840), The Hero as Divinity
Context: No nobler feeling than this of admiration for one higher than himself dwells in the breast of man. It is to this hour, and at all hours, the vivifying influence in man's life.

Letter to Governor Dinwiddie (29 May 1754)
1750s

The Saint's Tragedy (1848), Act ii, scene ix, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
Attributed

Revelations of Divine Love (c. 1393), Chapter 2
Context: For the Third, by the grace of God and teaching of Holy Church I conceived a mighty desire to receive three wounds in my life: that is to say, the wound of very contrition, the wound of kind compassion, and the wound of steadfast longing toward God. And all this last petition I asked without any condition.
These two desires aforesaid passed from my mind, but the third dwelled with me continually.

"The Palace of Art", st. 1 (1832)

Ist zwîvel herzen nâchgebûr,
das muoz der sêle warden sûr.
Bk. 1, st. 1, line 1; p. 15.
Parzival