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I suspect that it goes without saying, but I shall say it anyway: Mark Twain is one of those rare authors who can actually get away with saying something like this. And, in true Twain fashion, if you read the entire work, you will find the quote means much more when read in context.
I wish I could write half as well.
Quote:
“No fact is more firmly established than that lying is a necessity of our circumstances–the deduction that it is then a Virtue goes without saying.“