Origen was an early Christian scholar and theologian.  He is thought to have been Egyptian and was a teacher in Alexandria.  He wrote many scrolls on philosophy and theology including commentaries on all the books of the Bible.  He believed most scripture should be interpreted allegorically and was considered Neo-Pythagorean, and Neo-Platonist in his philosophy.  Origin considered the Trinity to be hierarchal with God the Father, the first principle, the head, and the Logos, Christ, was subordinate.  
    His writings mainly emphasized deep spiritual truths hidden within the Bible in allegory rather than it being historical facts.  He didn't deny that historical facts were in the Bible, but considered them far less important than the spiritual truths.  Unfortunately, much of his writings have been completely lost, or exist only in fragments. 
     He considered material things temporary and unimportant compared to the spiritual and to God.  He distinguished between the lower or the empirical Church and the higher or ideal Church.  He saw the mysteries of the Ideal Church, the real Church of Christ, as the only path to salvation.  He didn't believe in God as a little old man sitting on a cloud and sending lightning bolts at those who were bad.  To him God was a perfect unity, invisible and incorporeal, transcending all things material, and therefore inconceivable and incomprehensible. He is likewise unchangeable, and transcends space and time.  The only limit God has is his goodness, justice and wisdom.
    The Logos, Origen said, is the rational creative principle that permeates the universe. Since God eternally manifests himself, the Logos is likewise eternal. He forms a bridge between the created and uncreated, between God and man.
     Origen saw "The Fall" not as an act of evil, but a misguided use of freedom.  Once the spirit beings had fallen, thus departing from God, they came to be clothed in bodies, at first of "a fine ethereal and invisible nature," but later, as souls fell further away from God, their bodies changed "from a fine, ethereal and invisible body to a body of a coarser and more solid state. "
     He believed that, over time, there would be a progressive "cleansing of souls" removing all evil until the time they would be free of evil and would then be full for the Holy Spirit and unity with God.
    It has been said that Origen opposed the Gnostics, and perhaps he did oppose some Gnostic sects, but much of his teachings and philosophy match the Gnostic and Essene teachings, so it's hard to believe that he was opposed to all Gnostics.