The seaman was also learning-quickly-some of the principal lessons of the new style of naval warfare.
That, I believe, is the principal lesson of modern history, and if we tremble before it, it is because it contains a judgment on us.
He said the principal lesson was that the Government should resist elevating terrorist incidents such as hostage-taking into a major national concern.
Also important was a principal lessons of Cézanne: the indivisibility of form and color; a change in one would alter the other.
Ludwik Krasucki, a leading party theoretician, said the principal lesson to be drawn from the strikes was that "we must move forward with larger steps."
That is the principal lesson of the Cosm, like it or not.
Unpardonable is their continuing blindness to the principal lesson of the cold war - the Soviet empire collapsed abroad because it had failed at home.
The principal lesson, however, is that it is one thing to declare such worthy intentions and something else to carry them out.
Among the principal lessons taught by the period-instrument players, now in vogue, is that enthusiasm falls to players who have thought deeply about a particular field.
As he sees it, "one of the principal lessons of our tragic century" is "beware intellectuals."