Hence we must needs go on the open side,
And one by one; and I did fear the fire
On this side, and on that the falling down.

My Leader said: “Along this place one ought
To keep upon the eyes a tightened rein,
Seeing that one so easily might err.”

“Summae Deus clementiae,” in the bosom
Of the great burning chanted then I heard,
Which made me no less eager to turn round;

And spirits saw I walking through the flame;
Wherefore I looked, to my own steps and theirs
Apportioning my sight from time to time.

After the close which to that hymn is made,
Aloud they shouted, “Virum non cognosco;”
Then recommenced the hymn with voices low.

This also ended, cried they: “To the wood
Diana ran, and drove forth Helice
Therefrom, who had of Venus felt the poison.”

Then to their song returned they; then the wives
They shouted, and the husbands who were chaste.
As virtue and the marriage vow imposes.

And I believe that them this mode suffices,
For all the time the fire is burning them;
With such care is it needful, and such food,

That the last wound of all should be closed up.

Purgatorio: Canto XXVI