I've highlighted in color and bold the part of the sentence I didn't really understand. (Located at 08:16)
Quoted
Let me remind you that throughout the glorious period of history known as the Dark Ages precisely this mechanism of initiation and separation was employed by the Church to avoid its institutional power being questioned and to keep education, anything it deemed a threat to its establishment or even reading out of the reach of the remaining inhabitants of that socio-cultural landscape.
I went ahead and asked Ben for more info and here's what he had to say:
Quoted
By preventing reading they built the system that excludes the ability to question or truly understand their structure. Same with the high priests of the economy.