The idea that “To catch a liar, just ask two questions…” is often shared online, sometimes even linked to famous figures. However, there’s “no solid historical record” that this quote actually came from Einstein. His name is simply used to give the advice more credibility.

Even so, the concept behind it has some truth. Detecting deception is less about instinct and more about paying attention to consistency. As explained, “detecting a lie doesn’t depend on magical intuition, but on observing consistency.”

Lying is mentally demanding. A person who isn’t telling the truth has to juggle multiple tasks at once. They must “invent details,” “maintain temporal consistency,” remember what they previously said, and manage their body language at the same time.

This mental effort creates opportunities for mistakes. Inconsistencies, hesitation, or contradictions may appear when someone is trying to keep their story straight.

The key idea is simple: careful questioning can reveal gaps. When someone is asked to repeat or explain details, the added pressure may expose differences in their story.

In the end, spotting a lie isn’t about tricks or quick formulas. It comes from listening closely, asking thoughtful questions, and noticing whether the story stays consistent over time.