Behold the dawn, that through the smoke rays out,
Already whitening; and I must depart—
Yonder the Angel is—ere he appear.”

Thus did he speak, and would no farther hear me.

Purgatorio: Canto XVII

Remember, Reader, if e’er in the Alps
A mist o’ertook thee, through which thou couldst see
Not otherwise than through its membrane mole,

How, when the vapours humid and condensed
Begin to dissipate themselves, the sphere
Of the sun feebly enters in among them,

And thy imagination will be swift
In coming to perceive how I re-saw
The sun at first, that was already setting.

Thus, to the faithful footsteps of my Master
Mating mine own, I issued from that cloud
To rays already dead on the low shores.

O thou, Imagination, that dost steal us
So from without sometimes, that man perceives not,
Although around may sound a thousand trumpets,

Who moveth thee, if sense impel thee not?
Moves thee a light, which in the heaven takes form,
By self, or by a will that downward guides it.

Of her impiety, who changed her form
Into the bird that most delights in singing,
In my imagining appeared the trace;