The sentence best fits in Blank 2 because it provides a continuation and elaboration on the disquieting experience mentioned before Blank 2. Before Blank 2, the passage introduces the disquieting nature of reading philosophy, and the sentence builds on that by explaining that the philosophical examination challenges the values around which one has organized their life, making them appear provincial, flatly wrong, or even evil. The sentence in question serves to articulate the difficulty and discomfort associated with this profound philosophical scrutiny, logically following the initial statement about the disquieting experience of reading philosophy. We can also see that the sentence ends with "...and way of life is difficult enough." This is immediately followed by the passage highlighting what's worse "What's worse, philosophers admonish each other to remain unsutured until such time as a defensible new answer is revealed or constructed.". So we can see that Sentence 2 serves as a preceding sentence to this.