Her track, where'er the goddess roves,

Glory pursue, and gen'rous shame,

Th' unconquerable mind, and freedom's holy flame.

Thomas Gray (1716-1771): The Progress of Poesy. II. 2, Line 10.

Thou has left behind

Powers that will work for thee,—air, earth, and skies!

There's not a breathing of the common wind

That will forget thee; thou hast great allies;

Thy friends are exultations, agonies,

And love, and man's unconquerable mind.

William Wordsworth (1770-1850): To Toussaint L' Ouverture.

What though the field be lost?

All is not lost; th' unconquerable will,

And study of revenge, immortal hate,

And courage never to submit or yield.

John Milton (1608-1674): Paradise Lost. Book i. Line 105.