Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An enlightening book about a larger than life hero

I feel that I got to know Jim Whittaker through my work with his identical twin brother, Lou, in writing his autobiography, "Lou Whittaker, Memoirs of a Mountain Guide." Jim and Lou's love of mountaineering and the lifestyle it engenders is infectious. Both books are a tribute to a life lived courageously and honestly, with great respect for the natural environment. These brothers, still identical twins at age 70, have attained many summits in their lifetime, and enriched the lives of many others along the way. As mountaineers are fond of saying, "The summit may be the goal, but it's the journey that matters." I hope readers enjoy the journey of reading about the lives of these extraordinary men.