The most sensible and intelligent of all nations in Europe lays down the rule, Never Interrupt! as the eleventh commandment. Noise is the most impertinent of all fonns of interruption. lt is not only an interruption, but also a disruption of thought. Of course, where there is nothing to interrupt, noise

I really cannot get the bold part. Would anyone please simply explain those?

Thanks in advance

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The most sensible and intelligent of all nations in Europe lays down the rule, "Never Interrupt!" as the eleventh commandment. Noise is the most impertinent of all forms of interruption. It is not only an interruption, but also a disruption of thought.

I really cannot get the bold part. Would anyone please simply explain those?

Thanks in advance

source: Mastering the SAT Critical Reading Test