If you simply take the 128 Evil and Erroneous Views to examine the master, you can clearly see it at a glance and tell whether he is true or fake and whether he is authentic or evil. Why would you need any other answers? If you are still not sure about it, you can directly see, from the robe that the master is wearing, which level he is, and how many buttons he has. No one can fake it. As for whether the master has retrograded, the robe he is wearing can tell you the answer, and no explanation is needed. Whether someone is holy or ordinary, one cannot pretend it.
