The retreat and disappearance of glaciers—there are only 160,000 left—means we're burning libraries and damaging the planet, possibly beyond repair. Bit by bit, glacier by glacier, rib by rib, we're living the Fall.

To know something, then, we must be scrubbed raw, the fasting heart exposed.

Animals give us their constant, unjaded faces, and we burden them with our bodies and civilized ordeals.

History is not truth versus falsehoods, but a mixture of both, a mélange of tendencies, reactions, dreams, errors, and power plays. What's important is what we make of it; its moral use. By writing history, we can widen readers' thinking and deepen their sympathies in every direction. Perhaps history should show us not how to control the world, but how to enlarge, deepen, and discipline ourselves.

Walking is also an ambulation of mind.

June marked the end of spring on California's central coast and the beginning of five months of dormancy that often erupted in fire. Mustard's yellow robes had long since turned red, then brown. Fog and sun mixed to create haze. The land had rusted. The mountains, once blue-hued with young oaks and blooming ceanosis, were tan and gray. I walked across the fallen blossoms of five yucca plants: only the bare poles of their stems remained to mark where their lights had shone the way.

Finally, the lessons of impermanence taught me this: loss constitutes an odd kind of fullness; despair empties out into an unquenchable appetite for life.