Arthur Muir is nonchalant about the record he holds as the oldest American to climb Mount Everest at age 75. He reached the summit of the world’s highest peak on May 23 of this year, not while eying the glory of breaking a record, but rather with the humble yet steady thought of achieving a treasured personal goal. Muir lives in the Chicago suburb of Northbrook. He worked as a lawyer for more than 35 years—not as a professional or lifelong mountain climber. Only two of the five highlights of his life involve mountain climbing. He revealed a key to his way of thinking, as well as to his lifetime achievements, when expressing his plan to retitle his standard public speaking presentation for groups. Originally titled “It’s Not About Success, It’s About Effort,” Muir changed it to, “It’s Not About the Summit, It’s About the Effort.” He believes firmly in …