The available public source only shows that Nigel Farage said, in a 2 December 2011 High Profiles interview, “I’m in this out of conviction.” That confirms the utterance, but it does not verify the underlying private state of mind or motive, which is not publicly corroborable from the record available here. (highprofiles.info) Sources: High Profiles, “Nigel Farage” interview page (https://highprofiles.info/interview/nigel-farage/).