There is nothing so useless as doing efficiently that which should not be done at all.
-- Peter Drucker
I disagree. I don't see why doing that which shouldn't be done at all inefficiently wouldn't be even more useless.
Edit: Ah, I see that was already discussed in the May 2009 thread.
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.