Yes, but when I discovered it, it stayed discovered.

On being told that a piece of work he thought was his discovery had duplicated an earlier mathematician's work. Quoted in "Pity the Scientist Who Discovers the Discovered" by Gina Kolata, New York Times: Week in Review (2006-02-05)

https://www.nytimes.com/2006/02/05/weekinreview/pi...