Henry James

The moment a familiar place becomes a solitude because of one stranger.

My second was a violent perception of the mistake of my first: the man who met my eyes was not the person I had precipitately supposed. There came to me thus a bewilderment of vision of which, after these years, there is no living view that I can hope to give. An unknown man in a lonely place is a permitted object of fear to a young woman privately bred; and the figure that faced me was—a few more seconds assured me—as little anyone else I knew as it was the image that had been in my mind. I had not seen it in Harley Street—I had not seen it anywhere. The place, moreover, in the strangest way in the world, had, on the instant, and by the very fact of its appearance, become a solitude.