I was recently asked to speak at the Religions for the Earth Conference on the topic “Outdoor Epiphanies,” an expression that might well summarize the meaning of my life. As John Muir famously said, “I only went out for a walk and finally concluded to stay out till sundown, for going out, I found, was really going in.”

To begin with, I want to state a scientific fact: all behavior is motivated by emotions. Or, in ordinary folk language, we are moved to action by the feeling of our hearts, not the thoughts in our minds.

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