"Any emotion, if it is sincere, is involuntary." ~ Mark Twain
From my collection of mostly pessimistic quotes.
Some people have been telling me they enjoyed the selection of aphorisms on this blog, so I've decided to make them more prominent and paging-friendly.
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Hey Douglas! I had no idea, and was taking a vacation. But since you took the time to confirm your registration here I googled the question and it seems to be from "Cooper's Prose Style," Letters from the Earth
Appears there as 'All emotion is involuntary when genuine.' http://pegasus.cc.ucf.edu/~jmundale/Twain.html