The claim "Nigel Farage is wildly optimistic about the future" is a claim about Farage's subjective state of mind — his personal disposition and feelings. The interview transcript from the High Profiles/Third Way interview (dated 2 December 2011) confirms that Farage himself stated, "I'm wildly optimistic" in response to being asked whether he was optimistic about the future, and he elaborated that "in the end, good conquers bad." However, per the evidence rules, sources that merely confirm the speaker uttered the claim are not evidence about the world, and a claimed state of mind falls squarely into the category of claims whose truth "rests on information that is not public and cannot be corroborated or contradicted by public evidence." Whether Farage genuinely felt "wildly optimistic" internally is not something that public evidence can establish or refute. While contemporaneous reporting shows Farage was upbeat about UKIP's electoral prospects around this time (BBC, 2011), that is about political outlook, not a verifiable measure of his internal optimism about the future in general. Sources: High Profiles / Third Way interview transcript, https://highprofiles.info/interview/nigel-farage/ ; BBC News, "Nigel Farage reveals Green secret and looks to future," https://www.bbc.co.uk/news/uk-england-16936634 ; BBC News, "English local elections: UKIP on the up, says Farage," https://www.bbc.com/news/uk-politics-13211585