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Origen was a great teacher, but he also had some non-Orthodox positions on Scripture and the faith in general. His teachings were specifically anathemitized by the Second Council of Constantinople in 1553, which inherently means you can't be a saint, since you are condemned, at least according to the Roman Catholic Church.
That said, he was also an ardent follower of Jesus, a prolific and influential teacher, and fighter of other heretics.
From this article in Christianity Today, for example:
But Origenβs interpretations pushed the boundaries of orthodoxy.
He believed, for instance, in the pre-existence of souls and that eventually everyone, including the Devil, would be saved. In addition, he described the Trinity as a hierarchy, not as an equality of Father, Son, and Spirit. Though Origen attacked Gnosticism, in many ways, like the Gnostics, he rejected the goodness of the material creation. His critics have always complained that in many ways this teacher was βblinded by Greek culture.β
Between the pre-existence of souls and his unorthodox view of the Trinity, he was technically a heretic, albeit one with probably very good intentions. The Coptic church, and his Alexandrian school of thought had many followers, but even they will admit his teachings were mixed.
Obligatory joke about Origien: https://christianity.stackexchange.com/a/6467/1039
Upvote:2
Origen is today considered controversial because of some of his views. (Even Saint Augustine had some views with which the church disagreed). Although he is considered controversial today, during his time he was the definition of theology, whether you agreed with him or not.
To be canonized in either of the apostolic confessions you must show evidence of sainthood by the performance of a miracle. There could be arguments for it, but there is no solid evidence that any miracles ever accompanied his ministry. His teachings, however, are still highly relevant in understanding the development of systematic theology within the church. For that he still commands the respect of the church.