What are the folk fortune tellers?

Why do fortune tellers often say that secrets cannot be revealed?

Fortune tellers are often good at observing people's psychology and know how to use it to achieve their goals. Fortune tellers often ask fortune tellers ambiguous questions, because ambiguous questions often make people speculate and imagine in their own direction.

Everyone has a "self-verification" mentality. When they are given a hint, a series of contents related to the hint will immediately emerge in their minds.

Therefore, when you hear the fortune teller say that you are "predestined friends with water", you can't help but find out all your experiences or things related to water to prove that you are really related to water, and even think of what happened to your leg cramp when you were swimming.

Fortune tellers use people's psychology to provide some vague information for them to verify, thus concretizing the fuzziness of information and making fortune tellers feel that they are really scheming.