A quick search on Google threw up:
Originally posted by skorman00
It's 6am, so his name escapes me, but one of the creators of C once said "Debugging is twice as hard as coding. Therefore if you code as cleverly as possible, you are by definition unable to debug your own code."
Just an amusing quote that I liked.
“Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.” – Brian W. Kernighan