Why might the author's brother have been motivated to explore the counterarguments presented about Stein's work?

The motivation to explore counterarguments often stems from a desire to deepen one’s understanding of a subject. By considering different perspectives on Stein's work, the author's brother likely aimed to validate his own interpretations and comprehension of it. Engaging with opposing viewpoints can enhance critical thinking and strengthen knowledge, as it encourages the individual to assess the strength of their positions against contrasting ideas. This process not only affirms or challenges one's understanding but also fosters a more nuanced grasp of the subject, allowing for a more informed and rounded perspective on Stein's work.