It was on a wiki page that was lost in a shuffle years ago. HOWEVER! I managed to track down a copy of the page, and hosted it myself. Here's the one I was paraphrasing:

<Cale> stepcut: You know a library is good when just reading about it removes the particular task it performs from your life altogether.

It's a pretty funny quotes page, if you like Haskell. And I wouldn't feel right if I didn't include my favorite thing from that page, concerning the proper indentation of C code:

"In My Egotistical Opinion, most people's C programs should be indented six feet downward and covered with dirt." -- Blair P. Houghton

Having fought far too many segfaults, and been irritated by the lack of common data structures in libc, I can only agree.