Story highlights Best-selling author John Green confesses he didn't write a quote widely attributed to him

Green was selling posters based on the quote

Green's "The Fault in Our Stars" was adapted into a hit movie in 2014

(CNN) "I'm in love with cities I've never been to and people I've never met."

It's a quote that you may have seen online, attributed to best-selling author John Green. The sentiment is certainly thought-provoking, but there's one problem: Green never wrote it.

The writer, whose hit book "The Fault in Our Stars" was made into a hit movie last summer, made the revelation in a YouTube video he posted on Tuesday, after only recently having realized what he said was a mistake.

"When I saw the quote, I assumed it came from [my book] 'Paper Towns,'" he said.

"People kept sourcing it as coming from 'Paper Towns.'"

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