I couldn't decide whether to quote the long chunk or just the bumper-sticker-sized slogan at the end, so I'm hedging my bets and bolding the soundbite.
"[...] Free flow of information is the only safeguard against tyranny. The once-chained people whose leaders at last loose their grip on information flow will soon burst with freedom and vitality, but the free nation gradually constricting its grip on public discourse has begun its rapid slide into despotism. Beware of he who would deny you access to information, for in his heart he dreams himself your master." -- UN Commissioner Pravin Lal, a character in the game "Warring Factions" and/or the game "Alpha Centauri"
(I'm not sure whether the games are related, and if so, how. Neither am I certain what player or game designer actually authored that quote to put into the character's mouth. But searching the web for it leads back to pages related to both games. In one it's listed as coming from "U.N. Declaration of Rights", and in the other it's from "Librarian's Preface". Clues appreciated.)