  Numenius had a powerful influence on contemporary and later philosophers, pagans and Christians alike. His impact was particularly pronounced on Plotinus and on many Platonists of Plotinus' generation. It is possible that Numenius exercised some influence already on Ammonius Saccas, the teacher of Plotinus and the Christian Origen (see Nemesius, De natura hominis 69–72 Matthaei; fr. 4b), given that all of Ammonius' students about whom we know anything show respect for and knowledge of Numenius' thought despite their disagreements on specific topics in Platonist philosophy. The main issue which divides Ammonius and his followers from Numenius is the number of the intelligible principles. The pagan Origen, another student of Ammonius, is a rigorous monist, holding that the supreme god is also the creator of the universe (Porphyry, Life of Plotinus 3.32, Proclus, Platonic Theology II.4.9-22; see Saffrey-Westerink, Proclus Théologie Platonicienne vol. II, X-XX). Longinus, who studied both with Ammonius and the Christian Origen (Porphyry, Life of Plotinus 20.36–37), apparently also committed himself to this kind of metaphysical monism (Proclus, In Timaeum I.322.18–26; Longinus fr. 60 Männlein-Robert, 538–540), possibly in reaction to Numenius, whose work he reportedly knew well (Porphyry, Life of Plotinus 20.74–76). Also well acquainted with Numenius' philosophy was Cronius, Numenius' contemporary (frs. 46b 48), as well as Atticus (see Life and Work). Numenius' work was particularly appreciated by the early Christians. The Christian Origen was reportedly a keen reader of the works of Numenius as he was of Plato and of Pythagoreans other than Numenius, like Moderatus and Nicomachus (Eusebius, Ecclesiastical History VI.19.8). Indeed Origen has an impressive knowledge of Numenius' work. This becomes evident in that he often cites verbatim from it in his Against Celsus (I.15; fr. 1b, IV.51; fr. 1c, 10, V.57; fr. 29, V.38; fr. 53), which is remarkable given that Origen normally cites only from Scripture (see Kritikos, 2007, 406–7). The practice of quoting verbatim from Numenius' work is inherited by Eusebius, who has preserved more fragments of Numenius than any other ancient author.