Answered by Quan Yin messenger
(Originally in Chinese)
Q: For a person who has fully developed his third eye, is it possible for him to see heaven and hell by his own will without any restrictions?
A: The situation is not the same for everyone whose third eye has opened. Some practitioners do not care about seeing any realms; therefore, they do not see. They develop other aspects instead. For instance, they develop their wisdom, or expand their love, etc. Someone who is inclined towards developing his inner vision (third eye) can see heaven and hell by his own will.