“The habit of mobility had become ingrained.”

“The only protection as a historian is to institute a process of research and writing that minimizes the possibility of error. And that I have tried to do, aided by modern technology, which enables me, having long since moved beyond longhand, to use a computer for both organizing and taking notes.”

“Taft was Roosevelt's handpicked successor. I didn't know how deep the friendship was between the two men until I read their almost four hundred letters, stretching back the to early '30s. It made me realize the heartbreak when they ruptured was much more than a political division.”

“That is what leadership is all about: staking your ground ahead of where opinion is and convincing people, not simply following the popular opinion of the moment.”

“I shall always be grateful for this curious love of history, allowing me to spend a lifetime looking back into the past, allowing me to learn from these large figures about the struggle for meaning for life.”

“Those who knew Lincoln described him as an extraordinarily funny man. Humor was an essential aspect of his temperament. He laughed, he explained, so he did not weep.”

“Lincoln, considering a Cabinet nominee: "He is a Radical without the petulance and fretfulness of many radicals.”

“Teddy Roosevelt "had relished "every hour" of every day as president. Indeed, (he was) fearing the "dull thud" he would experience upon returning to private life.”

“I liked the thought that the book I was now holding had been held by dozens of others.”

“In the reflected gaze of his (her husband's) steady admiration, she saw the face of the girl he had fallen in love with.”

“Excitement about things became a habit, a part of my personality, and the expectation that I should enjoy new experiences often engendered the enjoyment itself.”