I would propose here that every teacher must be a history teacher. To teach, for example, what we know about biology today without also teaching what we once knew, or thought we knew, is to reduce knowledge to a mere consumer product. It is to deprive students of a sense of the meaning of what we know, and of how we know. To teach about the atom without Democritus, to teach about electricity without Faraday, to teach about political science without Aristotle or Machiavelli, to teach about music without Haydn, is to refuse our students access to The Great Conversation. It is to deny them knowledge of their roots, about which no other social institution is at present concerned.

Neil Postman – Technopoly.