what is the of exact original/source text of "Life is really simple, but we insist on making it complicated"
On the wikipedia page for Confucius, in the "Misattributed" section, you can find this quote:


  Life is really simple, but we insist on making it complicated.
  
  Attributed on the internet but not found in print prior to an attribution in Aero Digest, 1949, p. 115