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.