Writing is an Idea

Quote from Ideas A History From Fire To Freud by Peter Watson:

Writing is an idea, a very important idea, which was invented before 3000 BC. Today, however, we tend not to regard letters or words as inventions, as we do computers or mobile phones, because they have been so long with us. But inventions are evidence of ideas. I have treated language an an idea, because language reflects the way that people think, and the ways in which languages differ characterize the social and intellectual history of different populations. In addition, most ideas are conceived in language. Thus I consider th history and structure of the world's most intellectually influential languages: Chinese, Sanskrit, Arabic, Latin, French and English.