>>855008
I'm trying to understand how you are using these terms, and certainly they are quite different from how I or most people would use them.
Gnosticism was a specific cult which had certain concrete beliefs that militate squarely against Scripture, relying on the corruption of Scripture itself as well as the assertion that the surface meaning was false and a mere front designed purely as a vehicle to communicate the hidden knowledge supposedly contained within, the knowledge of which was limited to a select few in the inner circles of the cult organization.
We see gnosticism in its primitive state with the rise of the Marcionite cult, which stated, that Scripture had been corrupted by 140 AD and had to be restored by a new "Joseph Smith"-like figure, namely Marcion himself. This new revelation was taught by them, to have occurred 115 and a half years after Christ. So we see that without even getting into the specific teachings involved here (like dualism; an inner spark being broken off pieces of a god; reincarnation or purgatory), that it really has nothing to do with the inherent doctrine of Christ contained in the original 1st Century Scripture.
What you are probably thinking of is mysticism. But this is very broadly defined. It may or may not refer to truths comporting with what God's word says. For instance, the apostle Paul speaks of mysteries, such as that of the Triune God in Colossians 2:2, and also of the hypostatic union in Colossians 2:9 and 1 Timothy 3:16 (KJV). These are said to be taught by revelation of Jesus Christ (Galatians 1:11-12), so that they are no longer hidden but now revealed (Colossians 1:26, 1 Corinthians 2:7-8). This is in contrast with the claims of ancient and modern gnosticism (including modern Judaism, btw), which insist that in Scripture some hidden meaning trumps all surface level and immediate meanings which are merely a cheap covering for the supposed hidden teaching encoded within. This "hidden meaning" is supposedly only accessible by the dragon masters or ultra super rabbis of the selected cult who then teach it to their followers rather than have them read the Gospel for themselves.
>middle Platonism.
Neoplatonism was largely founded by Porphyry. And we read of Porphyry this:
>“To Porphyry (q.v.) belongs the credit of having recast and popularized the system of his master Plotinus. He was not an original thinker, but a diligent student, distinguished by great learning, by a turn for historical and philological criticism, and by an earnest purpose to uproot false teaching, especially Christianity…
>“As he advanced in life, Porphyry protested more and more earnestly against the rude faith of the common people and their immoral worships. His work Against the Christians was directed, not against Christ, nor against what he believed to be Christ’s teaching, but against the Christians of his own day and their sacred books… [I]n his trenchant criticism of the origin of what passed for Christianity in his time, he spoke bitter and severe truths, which have gained for him the reputation of the most rabid and wicked of all the enemies of Christianity…
>“Porphyry marks the transition to a new phase of Neoplatonism, in which it becomes completely subservient to polytheism, and seeks before everything else to protect the Greek and Oriental religions from the formidable assault of Christianity…”
See: “Neoplatonism,” Encyclopædia Britannica 14th ed. (1929), Vol 16, p. 219-220