An habitual truth-teller is simply an impossible creature; he does not exist; he never has existed.
 Mark Twain, On the Decay of the Art of Lying (1880). copy citation

add
Author Mark Twain
Source On the Decay of the Art of Lying
Topic truth
Date 1880
Language English
Reference
Note
Weblink http://www.gutenberg.org/cache/epub/2572/pg2572-images.html

Context

“and those whom a sick conscience worries into habitual violation of the maxim are imbeciles and nuisances." It is strong language, but true. None of us could live with an habitual truth-teller; but thank goodness none of us has to. An habitual truth-teller is simply an impossible creature; he does not exist; he never has existed. Of course there are people who think they never lie, but it is not so—and this ignorance is one of the very things that shame our so-called civilization. Everybody lies—every day; every hour; awake;” source