They’re talking about things of which they don’t have the slightest understanding, anyway. It’s only because of their stupidity that they’re able to be so sure of themselves.

Franz Kafka (1883-1924) Czech-Austrian Jewish writer

The Trial, ch. 1 (1925) [tr. Wyllie (2003)]
    (Source)

The protagonist Josef K., musing over the minor functionaries who have arrested him on unknown charges.