I'm not sure what he means in the passage, "I enter into discussion and argument with great freedom and ease, inasmuch as opinion finds me in a bad soil to penetrate and take deep root in. No propositions astonish me, no belief offends me, whatever contrast it offers to my own. There is no fancy so frivolous and so extravagant that it does not seem to me quite suitable to the production of the human mind." I'm trying to write a report but I cant get to the full understanding of this quote.