The key idea developed in the text is the idea that men are denying women and slaves the inalienable rights they were born with.
This is reinforced by the sentence: "There is but one law for souls, and, if there is to be an interpreter of it, he must come not as man, or son of man, but as son of God."
We can arrive at this answer because:
According to the author, this is proven because men decide to adapt in their own way and for their own benefit what God left for everyone.
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