From: Star Wars (specifically, Star Wars: Episode I: The Phantom Menace
Genre: Movies
Who said it?: Qui-Gon Jinn
The story behind the quote: This week’s quote comes from the first of the Star Wars prequels, Episode I: The Phantom Menace. The film was released in 1999 and was highly anticipated as this was George Lucas returning to the Star Wars franchise that he launched way back in 1977. However, this film, as well as the next two, were set before the original trilogy, making them prequels.
The quote comes early in the film. After Qui-Gon Jinn and Obi-Wan Kenobi, two Jedis Knights, escape from a Trade Federation ambush. They get separated in Naboo. As the Trade Federation tanks destroy the land, Qui-Gon runs across and saves the Gungan Jar-Jar Binks, who was just standing around instead of trying to find cover. Qui-Gon is annoyed as Jar-Jar was essentially a deer in the headlights and calls him brainless. When Jar-Jar retorts that he can’t be brainless as he knows how to speak, the Jedi Master delivers the quote.
Geek wisdom: Always take the time to think before you speak. A wise person will only speak when he needs to. A dumb person will just blurt out anything that comes to mind without thinking if it’s even worth talking about.
My Geek Wisdom 
Should Lucas have taken his own advice before making those damned prequels?!