But there is yet a liberty unsung
By poets, and by senators unpraised,
Which monarchs cannot grant, nor all the powers
Of earth and hell confederate take away;
A liberty which persecution, fraud,
Oppression, prisons, have no power to bind;
Which whoso tastes can be enslaved no more.
Tis liberty of heart, derived from Heaven,
Bought with his blood who gave it to mankind,
And sealed with the same token. It is held
By charter, and that charter sanctioned sure
By the unimpeachable and awful oath
And promise of a God. His other gifts
All bear the royal stamp that speaks them his,
And are august, but this transcends them all.

William Cowper,
The Task (Book V, The Winter Morning Walk)