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Origen wrote extensively. According to Epiphanius he produces some 6,000 works. In addition to some spurious efforts, his writings can be divided into four classes: [[text criticism]]; [[exegesis]]; systematic, practical, and apologetic theology; and letters. Of all these works his most important writing was the ‘''Hexapla'', a textual criticism that compared various translations of the [[Old Testament]]. However, only some portions of this work have come down to us. The full text is no longer extant.