Topic
Ideas in this collection have a social life as much as an intellectual one. Hugo's invasion-of-armies observation — an army can be resisted, but not an idea whose time has come — is the strongest claim for the power of thought over force. Twain on the crank with the new idea restores the social reality: new ideas look like madness until they don't, and the person carrying them pays for the transition. Thoreau's aircastle instruction — build them in the air, where they belong, then put foundations under them — makes the movement from idea to structure Thoreau's central practical lesson. Edison's good imagination and pile of junk returns: ideas always work with existing materials, never from nothing. Lincoln on books showing you your ideas weren't new is the deflation that serious thinkers need. Elizabeth Barrett Browning's "I have loved you in the idea of you my whole life long" arrives as a surprise: ideas are not only abstract propositions but shapes of longing. What the collection argues is that ideas are not the property of solitary geniuses but the common inheritance of people who read, look, and ask what else might be possible.
An idea, to be suggestive, must come to the individual with the force of revelation.