This quote underscores the intrinsic nature of truth and falsehood, regardless of public perception. "The truth is the truth even if no one believes it" emphasizes that the veracity of a statement remains unchanged regardless of whether others accept or acknowledge it. This speaks to the objective nature of truth, existing independently of popular opinion.
On the other hand, "a lie is a lie even if everyone believes" highlights the contrast between truth and deception. It underscores the fact that a falsehood doesn't become true simply because it gains widespread acceptance. This emphasizes the inherent falseness of deceitful statements, irrespective of how many people may be convinced otherwise.
In essence, the quote encourages a reflection on the fundamental nature of reality and perception. It serves as a reminder to discern between objective truth and the beliefs that people hold, urging critical thinking and a willingness to acknowledge the veracity of facts even if they challenge widely held beliefs.