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Mr. Witt! When I have the impertinence to climb into your pulpit to deliver a sermon, then you can tell me my duty.
— Chard · Zulu

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker rejects advice about duty by proposing a reversed intrusion: taking over Mr. Witt's pulpit to give a sermon. The comparison makes the criticism sound presumptuous. It asks each person to respect a boundary around the other's responsibilities.
Context reviewed