Can you specify more about what parts of the quote are confusing?
This one isn't that bad. (For utter, words-don't-work-that-way confusion, see Debord. Or good ol' Hegel.)
Whatever its political, pedagogical, cultural content, the plan is always to get some meaning across,
That bit is straightforward.
to keep the masses within reason;
"The masses" has a standard denotation but various connotations. Freddy Nietzsche talks about enthusiastic young people, which is more specific.
What's "to keep within reason"? What this evokes is talking someone down, preventing outbursts. Applied to the masses, doe...
Here's the new thread for posting quotes, with the usual rules: