"Although our intellect always longs for clarity and certainty, our nature often finds uncertainty fascinating."

"The political object is the goal, war is the means of reaching it, and the means can never be considered in isolation form their purposes."

"Two qualities are indispensable: first, an intellect that, even in the darkest hour, retains some glimmerings of the inner light which leads to truth and second, the courage to follow this faint light wherever it may lead."

"War is the continuation of politics by other means."

"You need to put what you learn into practice and do it over and over again until it's a habit. I always say, 'Seeing is not believing. Doing is believing.' There is a lot to learn about fitness, nutrition and emotions, but once you do, you can master them instead of them mastering you."

"My attitude to writing is like when you do wallpapering, you remember where all the little bits are that don't meet. And then your friends say: It's terrific!"

"I really do inhabit a system in which words are capable of shaking the entire structure of government, where words can prove mightier than ten military divisions."

"Productivity is being able to do things that you were never able to do before."