Jedi Seeker Mordaunt Kreel was an unconventional thinker. In his capacity as a Seeker, he aided those on different planets, and fought the Dark Side wherever he found it. His constant encounter with the Dark Side made Master Kreel reflect upon the unnatural, fractured nature of the Force.
During quiet moments of space travel, Master Kreel wrote a treatise called The Force in Unity, which posited that those who were Force wielders would be healthier if they stopped repressing their feelings and releasing their attachments to family and friends. One of his most important ideas was that Jedis who repress themselves are the cause of the Dark Side, and if Jedis supported the whole range of emotions, the Dark Side of the Force would no longer exist.
Most Jedi regarded Master Kreel’s pamphlet at best as naive, but some more fundamental Jedi saw the tract as blasphemous, which is why the tract soon became called Jedi Heresy. Master Kreel was censured by the Council for positing this opinion, but since he was scheduled to return to his wandering ways, the Council thought the matter closed.
There remained the matter of what to do with Master Kreel’s Padawan. As is the case with Padawans, Eden Arborlane embraced her master’s philosophy and became one of its biggest proponents. The Council felt that since she was young, she could be reformed. She was promoted to a full Jedi, but like her master, it was felt that she should be banished from the temple on Coruscant, and she was assigned to archive a newly discovered Jedi Temple on the isolated planet of Oshira.
Shortly before Eden left, Master Kreel was killed in a hyperspace accident. Eden always believed the Jedi Council arranged the accident because of Master Kreel’s beliefs, and going forward, Jedi Heresy was removed from the temple library.