Given the excerpt, Freneau means that: That even the most rational-minded must admit to the power of the Native American imagination.
To understand the meaning of the phrase so used, the background knowledge that Indians were viewed as inferior by the whites can be helpful.
So, we see that Freneau means that even those who believe that they are wiser than the Native Indians will submit to their ways of thinking.
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The way you yourself think the story was supposed to go.Everyone can have their own interpretation of this.