
“Any fool can criticize, condemn, and complain — and most fools do.”
Attributed in various post-2000 works, but actually Dale Carnegie in How to Win Friends and Influence People p.14 http://books.google.com/books?id=yxfJDVXClucC&pg=PA14&dq=fool, published in 1936. (N.B. Carnegie is quoting Franklin immediately prior to writing this, so attribution could be due to a printing error in some edition).
Misattributed