Although I don't follow that path myself, I have a great respect for those that do.
Actually it's very similar to some Hindu and Buddhist thought. If the passage that someone called gobbledegook were paraphrased as advising the person who seeks salvation to seek to unite themself to Brahma, perhaps it might be more comprehensible. I think the translation is the two-hundred year old one by Thomas Taylor, whose style can get as difficult to follow as the original Greek!
True that Taylor's style & vocabulary is hard for us to follow, so Prometheus Trust put together a Glossary that does help somewhat:
http://www.prometheustrust.co.uk/Glossary.pdf
However, we cannot put the difficulty only on the shoulders of translators. Mystic writings are about the non-conceptual or at least the trans-conceptual, so language is a poor transfer medium.
Here is more Proclus from his
Elements, yet translated by the modern Dodds. Still not a snap to comprehend.
PROP. 1.
Every manifold in some way participates unity.
For suppose a manifold in no way participating unity. Neither
this manifold as a whole nor any of its several parts will be one;
each part will itself be a manifold of parts, and so to infinity; and
of this infinity of parts each, once more, will be infinitely manifold;
for a manifold which in no way participates any unity, neither as
a whole nor in respect of its parts severally, will be infinite in every
way and in respect of every part. For each part of the manifold -- take
which you will -- must be either one or not-one; and if not one,
then either many or nothing. But if each part be nothing, the
whole is nothing; if many, it is made up of an infinity of infinites.
This is impossible: for, on the one hand, nothing which is is made
up of an infinity of infinites (since the infinite cannot be exceeded,
yet the single part is exceeded by the sum); on the other hand,
nothing can be made up of parts which are nothing. Every manifold,
therefore, in some way participates unity.
