Book excerpt: Every now and then the past yields up one of its lost treasures. This book is just such a gem. Bronson Alcott, friend and sometimes mentor to Emerson and Thoreau in Concord, was also a visionary educator who believed that the psyche of a child already carries within it the imprint of spirit and wisdom. At his school in Boston in the 1830s, he held this extraordinary series of conversations on such themes as spirit, consciousness, conscience, love, humility, the Holy Ghost, and the knower.