[5][6][7] The Guardian of the Threshold is also the title of the third play (of a tetralogy of Mystery Dramas) written by Rudolf Steiner in 1912.
It is the Cerberus guarding the entrance to Hades; the Dragon which St. Michael (spiritual will-power) is going to kill; the Snake which tempted Eve, and whose head will be crushed by the heel of the woman; the Hobgoblin watching the place where the treasure is buried, etc.
He is the king of evil, who will not permit that within his kingdom a child should grow up, which might surpass him in power; the Herod before whose wrath the divine child Christ has to flee into a foreign country, and is not permitted to return to his home (the soul) until the king (Ambition, Pride, Vanity, Self-righteousness, etc.)
"[9] According to Max Heindel, the Dweller on the Threshold must be confronted by every aspirant—usually at an early stage of his progress into the unseen worlds—and is one of the main causes of obsession.
[5] Steiner explained that the meeting with the Guardian of the Threshold as presented in those dramas was to show that a person (man or woman) who had made the soul clairvoyant, must go back and forth across that threshold and know how to be rightly in the spiritual world on the far side, as well as on this side in the physical world.