Marshall, Marshall, Marshall

"Today we are beginning to notice that the new media are not just mechanical gimmicks for creating worlds of illusion, but new languages with new and unique powers of expression." (1957)
- - Marshall McLuhan

40 years later, the man still roars. More on his Wiki page - In addition to the crucial "The medium is the message",  here are a a few of my favorites:

Everybody experiences far more than he understands. Yet it is experience, rather than understanding, that influences behavior. 

Art is anything you can get away with. (no, this isn't Warhol's even if he lived it)

There are no passengers on spaceship earth. We are all crew. (how Green!)