And losing solitude, what have they lost? First, the propensity for introspection, that examination of the self that the Puritans, and the Romantics, and the modernists (and Socrates, for that matter) placed at the center of spiritual life — of wisdom, of conduct. Thoreau called it fishing "in the Walden Pond of [our] own natures," "bait[ing our] hooks with darkness." Lost, too, is the related propensity for sustained reading.