What though the field be lost?

We are reminded by Tyler Cowen that today is the three hundred and thirty first anniversary of John Milton's death. From Paradise Lost:

"... What though the field be lost?
All is not lost—the unconquerable will,
And study of revenge, immortal hate,
And courage never to submit or yield:
And what is else not to be overcome?
That glory never shall his wrath or might
Extort from me. To bow and sue for grace
With suppliant knee, and deify his power
Who, from the terror of this arm, so late
Doubted his empire—that were low indeed;
That were an ignominy and shame beneath
This downfall; since, by fate, the strength of Gods,
And this empyreal sybstance, cannot fail;
Since, through experience of this great event,
In arms not worse, in foresight much advanced,
We may with more successful hope resolve
To wage by force or guile eternal war,
Irreconcilable to our grand Foe,
Who now triumphs, and in th' excess of joy
Sole reigning holds the tyranny of Heaven."