Can you explain the purpose of the Gom Jabbar?
The Gom Jabbar is a fictional tool that appears in Frank Herbert's novel Dune. In the story, it is a small box containing a needle, used as a test of humanity for members of the Bene Gesserit sisterhood. The test involves placing a hand into the box, and enduring the excruciating pain caused by the Gom Jabbar's poison, without withdrawing the hand. If the person passes the test, it demonstrates that they have the strength of will and self-control necessary to be a Bene Gesserit. If they fail, they will die from the poison. The Gom Jabbar thus serves as a symbol of the Bene Gesserit's power and authority, as well as a way for them to test and recruit potential members.
Which characters in Dune have successfully endured the Gom Jabbar?
In Frank Herbert's science fiction novel Dune, the Gom Jabbar is a test of human endurance and mental strength. It is administered by the Bene Gesserit, a secretive and powerful sisterhood with advanced abilities. The Gom Jabbar test involves placing a person's hand in a box that induces extreme pain while testing their ability to control their fear and pain. Only those who are mentally strong and able to endure the pain without withdrawing their hand are considered to have passed the test. In the novel, only two characters are known to have successfully endured the Gom Jabbar:

1. Paul Atreides - The protagonist of the novel, Paul Atreides, undergoes the Gom Jabbar test administered by the Reverend Mother Gaius Helen Mohiam, a Bene Gesserit member. Despite experiencing intense pain, Paul manages to control his fear and endure the test without withdrawing his hand, proving his exceptional mental strength and fortitude.
2. Alia Atreides - Paul's sister, Alia Atreides, who is also known as Saint Alia of the Knife, is another character in the novel who successfully endures the Gom Jabbar. Alia is a genetically enhanced individual with advanced mental abilities, and she too proves her mental strength by enduring the pain of the Gom Jabbar test without withdrawing her hand.

It is worth noting that the Gom Jabbar test is considered a significant and dangerous ordeal, and not all characters in the novel are able to successfully endure it. It serves as a powerful plot device to highlight the mental and emotional strength of certain characters, including Paul and Alia, as they navigate the challenges and dangers of the Dune universe.