“If a child is to keep alive his inborn sense of wonder … he needs the companionship of at least one adult who can share it, rediscovering with him the joy, excitement, and mystery of the world we live in.” – Rachel Carson, “The Sense of Wonder”

“Let children walk with Nature, let them see the beautiful blendings and communions of death and life, their joyous inseparable unity, as taught in woods and meadows, plains and mountains and streams of our blessed star, and they will learn that death is stingless indeed, and as beautiful as life.” – John Muir

And this one for some hiking humor:

“We’re not lost, we’re just misplaced.” – The Man with the Yellow Hat, “Curious George”