Spock's Inability to Lie
Spock's inability to lie leads to some funny moments in The Voyage Home. But I'm watching the Original Series episode "Errand of Mercy" and Spock has absolutely no problem telling the Klingons that he is a traveling merchant. When is it established that Vulcans never lie? Does that come up at some point in the original series? I'm guessing it might be one of the claims Vulcans make about themselves that are not necessarily true, kind of like when they claim to be exempt from emotional responses when they can sometimes be quite irritable.
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