Valentinian Gnosticism may have been monistic rather than dualistic. In the Valentinian myths, the creation of a flawed materiality is not due to any moral failing on the part of the Demiurge, but due to the fact that he is less perfect than the superior entities from which he emanated. Valentinians treat physical reality with less contempt than other Gnostic groups, and conceive of materiality not as a separate substance from the divine, but as attributable to an "error of perception" which becomes symbolized mythopoetically as the act of material creation.