In the first paragraph of the introduction, Wollstonecraft uses antithesis to emphasize the distance between the two contradictory scenarios she presents. The example of antithesis in the first paragraph is below for easy reference:
I have had to admit, sadly, that either nature has made a great difference between man and man, or that the world is not yet anywhere near to being fully civilized.
Both of these scenarios presented by Wollstonecraft may be intentionally difficult for a reader to accept; either nature has created all men so different from one another that a search for similarities is utterly futile, or the world as it stands at the time of writing is not as sophisticated and accepting of women, who are different to men, as her readers may think it is.
(The entire section contains 2 answers and 397 words.)