The last two stanzas are just quotes from the Second Epistle of Paul
the Apostle to the Corinthians 3:14-16 which have been
translated in the King James Version of the Bible as:

But their minds were blinded: for until this day
remaineth the same vail untaken away in the
reading of the old testament; which vail is
is done away in Christ.

But even unto this day, when Moses is read,
the vail is upon their heart.

Nevertheless when it shall turn to the
Lord, the vail shall be taken away.
 
The last three lines of the eighth staza are a
translation of the first lines that appear
in Georg Hegel's studies: in Book
VIII, 788 of his 1807 publication as
the Phenomenology of Spirit

While only John (18:1) associates
Gethsemene as a garden (he precedes
this by locating it beyond the brook/ravine
of Cedron/Kidron that is outside
of Jerusalem).