Cockerill, Gareth Lee. “Hebrews 12:18–24: Apocalyptic Typlogy or Platonic Dualism?” Tyndale Bulletin 69.2. (2018): 225–40.
"Those who have approached Hebrews either from the point of
view of apocalyptic eschatology or from the perspective of neoplatonism
have often misinterpreted the two 'mountains' in Hebrews 12:18-24. The
first understand these 'mountains' as representing the Old and New
Covenants; the second, the earthly and heavenly worlds. This paper
argues that the two 'mountains' represent two present possibilities. The
first is the present state and future destiny of the disobedient who
are excluded from fellowship with God; the second, the present state and
future destiny of the faithful who enter into that fellowship.
This interpretation is substantiated by a careful examination of
the text and confirmed by the way this interpretation fits with
Hebrews' rhetorical strategy and use of the Old Testament. Crucial to
the argument is the total lack of continuity between the two mountains
that would be essential to substantiate either of the traditional