and he gets it from the Bible:
The clearest way to see through a culture is to attend to its tools for conversation. I might add that my interest in this point of view was first stirred by a prophet far more formidable than McLuhan, more ancient than Plato. In studying the Bible as a young man, I found intimations of the idea that forms of media favor particular kinds of content and therefore are capable of taking command of a culture. I refer specifically to the Decalogue, the Second Commandment of which prohibits the Israelites from making concrete images of anything [as a representation of God]. “Thou shalt not make unto thee any graven image, any likeness of anything that is in heaven above, or that is in the earth beneath, or that is in the water beneath the earth.” I wondered then, as so many others have, as to why the God of these people would have included instructions on how they were to symbolize, or not symbolize, their experience [of him]. It is a strange injunction to include as part of an ethical system unless its author assumed a connection between forms of human communication and the quality of a culture. We may hazard a guess that a people who are being asked to embrace an abstract, universal deity would be rendered unfit to do so by the habit of drawing pictures or making statues or depicting their ideas [of him] in any concrete, iconographic forms. The God of the jews was to exist in the Word and through the word, an unprecedented conception requiring the highest order of abstract thinking. Iconography thus became blasphemy so that a new kind of God could enter a culture. People like ourselves who are in the process of converting their culture from word-centered to image-centered might profit by reflecting on this Mosaic injunction.
Neil Postman, Amusing Ourselves to Death (New York: Penguin, 1985), 8–9.