Our world grieves the loss of Senator John McCain, an extraordinary American war hero and political maverick. Regardless of whether our political convictions aligned with his, most agree Senator McCain leaves a legacy of courage, perseverance, civility and service.  He reminded us of radical ideals binding US citizens, "Despite our differences, much more unites us than divides us. We are fellow Americans, and that's an association that means more to me than any other."  In a chance encounter, he revealed his humble character to me. From that fortuitous meeting, I gleaned a transformative lesson.