Without moving his lips?

In his vastly enjoyable A History of Reading, Alberto Manguel tells the story, from the late 4th Century CE, of Augustine observing Ambrose reading:
Ambrose was an extraordinary reader. "When he read," said Augustine, "his eyes scanned the page and his heart sought out the meaning, but his voice was silent and his tongue was still. Anyone could approach him freely and guests were not commonly announced, so that often, when we came to visit him, we found him reading like this in silence, for he never read aloud."

Eyes scanning the page, tongue held still: that is exactly how I would describe a reader today, sitting with a book in a cafe across from the Church of St. Ambrose in Milan, reading, perhaps, Saint Augustine's Confessions. Like Ambrose, the reader has become deaf and blind to the world, to the passing crowds, to the chalky flesh-coloured facades of the buildings. Nobody seems to notice a concentrating reader: withdrawn, intent, the reader becomes commonplace.

To Augustine, however, such reading manners seemed sufficiently strange for him to note them in his Confessions.
I admit that when I encounter something particularly difficult for me to understand I'll read it out loud to myself so that perhaps by hearing what I'm reading I'll understand it better.

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