There are no nations! There is only humanity. And if we don't come to understand that right soon, there will be no nations, because there will be no humanity.
The greatest weapons in the conquest of knowledge are an understanding mind and the inexorable curiosity that drives it on.
One might suppose that reality must be held to at all costs. However, though that may be the moral thing to do, it is not necessarily the most useful thing to do. The Greeks themselves chose the ideal over the real in their geometry and demonstrated very well that far more could be achieved by consideration of abstract line and form than by a study of the real lines and forms of the world; the greater understanding achieved through abstraction could be applied most usefully to the very reality that was ignored in the process of gaining knowledge.