Walter Isaacson

"It certainly is true that a lot of really driven people are driven because they're harnessing the demons of their childhood"

"I mean, if I'm in situations, and I just mean even at dinner or something, I'm with somebody, I'm usually curious, and the conversation will proceed with questions. And I guess it's also because I'm pretty interested in what anybody's doing, whoever I happen to be with."

"Born and bred a member of the leather-aproned class, Franklin was, at least for most of his life, more comfortable with artisans and thinkers than with the established elite, and he was allergic to the pomp and perks of a hereditary aristocracy. Throughout his life he would refer to himself as "B. Franklin, printer." From these attitudes spring what may be Franklin's most important vision: an American national identity based on the virtues and values of its middle class. Instinctively more comfortable with democracy than were his fellow founders, and devoid of the snobbery that later critics would feel toward his own shopkeeping values, he had faith in the wisdom of the common man and felt that a new nation would draw its strength from what he called "the middling people." Through his self-improvement tips for cultivating personal virtues and his civic-improvement schemes for furthering the common good, he helped to create, and to celebrate, a new ruling class of ordinary citizens."

"For Einstein, as for most people, a belief in something larger than himself became a defining sentiment. It produced in him an admixture of confidence and humility that was leavened by a sweet simplicity. Given his proclivity toward being self-centered, these were welcome graces. Along with his humor and self-awareness, they helped him to avoid the pretense and pomposity that could have afflicted the most famous mind in the world. His religious feelings of awe and humidity also informed his sense of social justice. It impelled him to cringe at trappings of hierarchy or class distinction, to eschew excess consumption and materialism, and to dedicate himself to efforts on behalf of refugees and the oppressed."

"Leonardo was not always a giant. He made mistakes. He went off on tangents, literally, pursuing math problems that became time-sucking diversions. Notoriously, he left many of his paintings unfinished, most notably the Adoration of the Magi, Saint Jerome in the Wilderness, and the Battle of Anghiari. As a result, there exist now at most fifteen paintings fully or mainly attributable to him. Although generally considered by his contemporaries to be friendly and gentle, Leonardo was at times dark and troubled. His notebooks and drawings are a window into his fevered, imaginative, manic, and sometimes elated mind. Had he been a student at the outset of the twenty-first century, he may have been put on a pharmaceutical regimen to alleviate his mood swings and attention-deficit disorder. One need not subscribe to the artist-as-troubled-genius trope to believe we are fortunate that Leonardo was left to his own devices to slay his demons while conjuring up his dragons."

"The creativity that can occur when a feel for both the humanities and the sciences combine in one strong personality was the topic that most interested me in my biographies of Franklin and Einstein, and I believe that it will be a key to creating innovative economies in the twenty-first century."