Assertion: utmost diligence | /r/CapableOf | learn their language
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Source sentences:
text: In the meantime, he desired I would go on with my utmost diligence to learn their language, because he was more astonished at my capacity for speech and reason, than at the figure of my body, whether it were covered or not; adding, that he waited with some impatience to hear the wonders which I promised to tell him.