Early Christians including
Origen,
Gregory of Nyssa, and Augustine were influenced by Neoplatonism, but none accepted it uncritically and they rejected absolute monism and its
emanationists' views. Certain central tenets of Neoplatonism served as a philosophical interim for the
Christian theologian Augustine of Hippo on his journey from
dualistic Manichaeism to Christianity. As a Manichee, Augustine had held that evil has substantial being and that God is made of matter; when he became a Neoplatonist, he changed his views on these things. As a Neoplatonist, and later a Christian, Augustine believed that evil is a privation of good and that God is not material. Perhaps more importantly, the emphasis on mystical contemplation as a means to directly encounter God or the One, found in the writings of
Plotinus and
Porphyry, deeply affected Augustine. According to his own account of his important discovery of 'the books of the Platonists' in
Confessions Book 7, Augustine owes his conception of both God and the human soul as incorporeal substance to Neoplatonism. But Augustine was also critical of Neoplatonism doctrines and their formulations, and he rejected the Neoplatonists'
immaterialism. Other Christians assimilated Neoplatonist ideas, especially in their identifying the Neoplatonic One, or God, with
Yahweh. The most influential of these would be
Origen, who potentially took classes from
Ammonius Saccas (but this is not certain because there may have been a different philosopher, now called
Origen the Pagan, at the same time), and the late 5th century author known as
Pseudo-Dionysius the Areopagite. Neoplatonism also had links with
Gnosticism, which Plotinus rebuked in his ninth tractate of the second
Enneads: "Against Those That Affirm The Creator of The Kosmos and The Kosmos Itself to Be Evil" (generally known as "Against The Gnostics"). Due to their belief being grounded in Platonic thought, the neoplatonists rejected Gnosticism's vilification of Plato's
demiurge, the creator of the material world or cosmos discussed in the
Timaeus. Although neoplatonism has been referred to as orthodox Platonic philosophy by scholars like
Professor John D. Turner, this reference may be due in part to Plotinus' attempt to refute certain interpretations of Platonic philosophy, through his
Enneads. Plotinus believed the followers of gnosticism had corrupted the original teachings of Plato. Despite the influence this philosophy had on Christianity,
Justinian I would hurt later neoplatonism by ordering the closure of the refounded
Academy of Athens in 529. Nevertheless, members of the
rhetorical school of Gaza such as
Aeneas of Gaza or
Procopius of Gaza would synthesize neoplatonism with early orthodox Christian ideas without any disturbances. ==Middle Ages==