This quotation can be viewed in the context of a book
"I roamed the countryside searching for answers to things I did not understand. Why thunder lasts longer than that which causes it, and why immediately on its creation the lightning becomes visible to the eye while thunder requires time to travel. How the various circles of water form around the spot which has been struck by a stone and why a bird sustains itself in the air. These questions and other strange phenomena engaged my thought throughout my life."
"Humans have the ability to shift perspective. We can experience the world through our senses. Or we can remove ourselves from our senses and experience the world even less directly. We can think about our life, rather than thinking in our life. We can think about what we think about our life, and we can think about what we think about that. We can shift perceptual positions many times over."