I've seen other references *to* it, since 1994, but nothing from
  before. People regularly insert words and phrases into dead
  people's mouths that they didn't _quite_ say, which is why I
  search dilligently for it. He *did* have an interview with John
  B Kennedy published in Collier's Illustrated Issue 77 on January
  30, 1926. He _does_ say some of the things mentioned on that
  website you provided. However, the original is under copyright
  and so it would take a series of successful searches through the
  limited google books window to reconstruct it in its whole.
  Without a full scan of the page, I remain skeptical. A lie
  repeated frequently is still a lie. I'm not taking away from his
  genius. I just hate people being misquoted. I hope he was quoted
  correctly but Tesla has things added to his words CONSTANTLY and
  so that's why I give extra effort with him. == Here is the
  bibliographic record. Maybe someone can get a scan. It's amazing
  that for so many people requoting this quote, there is not ONE
  FULL SCAN of it online. I've seen it mentoned in various texts
  since 1994. They're ALL written in "AMAZING TESLA UNDERRATED
  GENIUS" type books. That makes me skeptical because people like
  to insert their own stuff into famous people's mouths. I'll
  agree he said something *similar* but did he says exactly that?
  I don't know. Google Books only allows limited windows into this
  but I don't trust rewrites from others who are also promoting
  the sale of their books on the subject. = Mind you, I _want it_
  to be a true quote. But I've seen *so many people* hawking their
  own books about Tesla and sticking words in his mouth, just like
  they do with Einstein, that it's maddening. I want an accurate
  picture of what he said, not "what I want to believe" about him.
  and Yes, he's underrated and yes, a lot of people make $$$
  selling books exaggerating it using plausible source materials
  but I need more to stand behind the meme as accurate. That's
  just me though. I'm anal about accuracy. ==