A person in the Song

"If he truly comes from the future, knowing his own position in the previous dynasty, would everything he says still be the truth If he reveals some statements to prove this and convince us, wouldn't it mean he could slander anyone he wants at will Then, with the power of decision in his hands, would we believe him or not",Therefore, one must absolutely not let him know where he is, only then can he speak the truth.,If one is born blind and has never seen light, the mind may be able to bear it.。