Whoever has lived alone, knows to what a degree monologue is innate. The inward word itches. Haranguing space is an outlet. To speak aloud and alone makes the effect of a dialogue with the god which is within one. This was, as is well known, the habit of Socrates. He harangued himself. So did Luther.

[Quiconque a vécu solitaire sait à quel point le monologue est dans la nature. La parole intérieure démange. Haranguer l’espace est un exutoire. Parler tout haut et tout seul, cela fait l’effet d’un dialogue avec le dieu qu’on a en soi. C’était, on ne l’ignore point, l’habitude de Socrate. Il se pérorait. Luther aussi.]

Victor Hugo (1802–1885) French writer, journalist, human rights activist, politician

The Man Who Laughs [L’Homme qui rit; The Laughing Man; By Order of the King], Part 1, Preliminary, ch. 1 (1.0.1) (1869) [tr. Phillips (1894)]
    (Source)

(Source (French)). Other translations:

Any one who has lived a solitary life knows how deeply seated monologue is in one's nature. Speech imprisoned longs to find a vent. To harangue space is an outlet. To talk out loud when one is alone is as it were to have a dialogue with the divinity within. It was, as is well known, a habit with Socrates; he declaimed to himself. Luther did the same.
[tr. Unknown (1869); Unknown, Authorized (1871)]

Any one who has lived alone, knows how natural monologue is. The inner word itches. Haranguing space offers a vent. Speaking aloud and alone, produces the effect of a dialogue with the god which one has within one. This was Socrates' habit, as the reader is aware. He declaimed. So did Luther.
[tr. Hapgood (1888)]

Anyone who has lived alone knows how much monologue is in nature. Inner speech itches. Haranguing the space is an outlet. Talking out loud and alone feels like a dialogue with the god within. It was, as we know, Socrates' habit. He used to talk to himself. Luther, too.
[tr. Lavelle (2003)]