Origen was a very great man of the Early Church, though he was condemned later by the Ecunemical Councils for several ideas attributed to him.
These include the notion of universalism (all in hell will be saved), the notion that human bodies are a ‘prison’ of sorts for the fallen soul, errors relating to the Trinity (the Logos was subordinate to the Father), and reincarnation.
Origen got a lot of these ideas from Platonic Philosophy, but Origen also was a towering genius who helped establish Christian mysticism, biblical interpretation, scientific analysis of the Bible and its languages, and philosophical and systematic theology. Origen also wrote extensive commentaries on the Bible as well as long apologetic works against Gnostics and Pagan critics of Christianity.
In my view we should give Origen a lot of leeway since when he speculated on these things, they were not formally laid down as official Church doctrine. Also, some of his ideas were extended by some of his followers, such as Evagrius of Pontus, in unhealthy directions.
A very good survey of Origen is given in a book by Danielou, and also in Bernard McGinn’s ‘A history of Christian mysticism’ - Volume 1.