“Miracles do not happen:” –‘t is plain sense,
If you italicize the present tense;
But in those days, as rare old Chaucer tells,
All Britain was fulfilled of miracles.
So, as I said, the great doors opened wide.
In rushed a blast of winter from outside,
And with it, galloping on the empty air,
A great green giant on a great green mare.

Charlton Miner Lewis (1866-1923) American scholar of English literature, author

Gawayne and the Green Knight, Canto 1 (1903)
    (Source)