An essential element for good writing is a good ear: One must listen to the sound of one's own prose.

Nothing sickens me more than the closed door of a library.

Without books, history is silent, literature dumb, science crippled.

The better part of valor is to spend it learning to live with differences, however hostile, unless and until we can find another planet.

It is wiser, I believe, to arrive at theory by way of evidence rather than the other way around.... It is more rewarding, in any case, to assemble the facts first and, in the process of arranging them in narrative form, to discover a theory or a historical generalization emerging of its own accord.

One constant among the elements of 1914—as of any era—was the disposition of everyone on all sides not to prepare for the harder alternative, not to act upon what they suspected to be true.

Arguments can always be found to turn desire into policy.