Because I identify with the Arrowsmith's story,
I came to appreciate how my brain (and every one's) is so different and unique.
For example, I now have a deeper appreciation for my love of music, having seen a documentary showing how some may not 'hear' anything at all (a condition known as amusia)..
Even our "personality" and eccentricities may have roots in brain structure.
And, of course, her story shows how careful self observation and strong intention can change who we are in terms of actual brain function.