CONUNDRUMS...
There are some people who will believe just about anything that anyone may say. Others will not believe anything that anyone may say. The key word is "believe."
Belief is a mental orientation whose factual support is optional, at best. The geometric opposite of belief is knowledge. Knowledge is factually corroborated belief, also optional.
Both belief and knowledge are true to those who suppose them such.
It is all conundrum, riddle, mystery.