"drew primarily on the ideas of their contemporary Andrew Jackson Davis, who in turn derived them from the eighteenth-century philosopher Emanuel Swedenborg--or from conversations, as Davis claimed, with Swedenborg's spirit. Davis had already produced an astonishing body of lectures and books developing what he came to call a "harmonial philosophy" in which like attracted like. So great were the similarities and affinities between beings of both worlds, Davis had written, that the recently deceased often failed even to recognize that they had died. Naturally, they felt a profound attachment to the mortals they had left behind.8"