1st cuz: " But I do feel that in his story of our final climb he is not quite fair to me;"
2nd cuz: "Hillary is my friend. He is a fine climber and a fine man, and I am proud to have gone with him to the top of Everest." and " But we were not leader and led. We were partners."
This is more about Hillary acting like he couldve done everything himself.
Being optimistic means that you think of positive things. This can help people become more calm and except more good results. This also helps reduce stress.