I shot a pic of this quote in July 2015 while in Yosemite Valley. It was the 125th Anniversary of Yosemite National Park.
I connected to the Eastern Sierra as a child, and it is still a very special place to me. Muir became one of my favorites when I immersed myself in hiking in my 20s in the Cuyamaca Mountains near San Diego, and then in Anza Borrego Desert State Park in my 30s.
I recommend reading "Meditations of John Muir: Nature's Temple" (compiled and edited by Chris Highland, 2001) - and maybe even keeping a copy in your backpack.