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" A poem by Billy Collins, poet laureate of the United States, captures the ache of loss at the end of childhood. Its title is significant: “On Turning Ten”: The whole idea of it makes me feel like I’m coming down with something, something worse than any stomach ache or the headaches I get from reading in bad light— a kind of measles of the spirit, a mumps of the psyche, a disfiguring chickenpox of the soul. You tell me it is too early to be looking back, but that is because you have forgotten the perfect simplicity of being one and the beautiful complexity introduced by two. But I can lie on my bed and remember every digit. At four I was an Arabian wizard. I could make myself invisible By drinking a glass of milk a certain way. At seven I was a soldier, at nine a prince. But now I am mostly at the window watching the late afternoon light. Back then it never fell so solemnly against the side of my tree house, and my bicycle never leaned against the garage as it does today, all the dark blue speed drained out of it. This is the beginning of sadness, I say to myself, as I walk through the universe in my sneakers. It is time to say good-bye to my imaginary friends, time to turn the first big number. It seems only yesterday I used to believe there was nothing under my skin but light. If you cut me I would shine. But now when I fall upon the sidewalks of life, I skin my knees. I bleed. "
― Marcus J. Borg , The Heart of Christianity: Rediscovering a Life of Faith
