Yeah, I posted that quote in your threat "What does your JKD look like?"
"Of my art--gung fu and jeet kune do--only one of 10,000 can handle it. It is martial art. Complete offensive attacks. It is silly to think that almost anyone can learn it. It isn't really contemporary forms of the art I teach. Mainly that which I work with--martial attack. It is really a smooth rhythmic expression of smashing the guy before he hits you, with any method available." -page 59 of Jeet Kune Do Bruce Lee's Commentaries on the Martial Way.
Let me explain, I think Lee meant that his method of fighting, his JKD, can only be used by few people. He is a thin guy with a small build, and he isn't all that tall, so he's bound to be faster and more agile, so he needed a fighting style to compliment his attributes. That's what his JKD does for him. Now could you imagine being 6'6" and 210 lbs. and trying to get the same results as Bruce Lee with your build, probably not gonna happen.
That's why Bruce wants people to use his teachings as guidelines, because he knows not everyone will be able to use JKD like he does, because NOT EVERYBODY CAN BE BRUCE LEE! I've been learning JKD for years now, and I found my nitch in martial arts. I'm 6'2" and 175 pounds, my arms and legs are longer than average, so I modified the basics to fit my mold. I focus primarily on fast, and accurate kicks.
He means what works for him might not work for someone else. So learn the fundamentals and built your own interpretation. Make it YOUR JKD.