They only make men like Wallace once a century, if that often.

To lift more lines from Burns (he put them in The Bruce's mouth but they work as well or better for Wallace):

Wha will be a traitor knave?
Wha can fill a coward's grave?
Wha sae base as be a slave?
Let him turn, and flee!

Wha for Scotland's King and Law
Freedom's sword will strongly draw,
Freeman stand, or freeman fa',
Let him follow me!

By Oppression's woes and pains,
By your sons in servile chains,
We will drain our dearest veins
But they shall be free!