biography of Steve Jobs is 656 pages long, but these three quotes (not included in it) sum up a huge portion of what Isaacson wrote:
1. "He's not the Messiah, he's a very naughty boy!"
This quote comes from Brian's mother in The Life of Brian and, while Jobs's god-like status in business is definitely earned, so too was his status (for a time) as a trouble-making kid.
2. "Do whatever you do intensely."
This quote comes from Robert Henri and advises something that Isaacson repeatedly shows Jobs put into practice.
3. "All he asked of life was the best of everything."
This quote comes from the daughter of the Italian inventor, Guglielmo Marconi, and is about her father's desire to have nothing less than the best; it also, however, applies to Jobs—as readers of Isaacson's biography will see in spades.