As Steals the Morn

Charles Jennens (1700–1773), from Part 3 (Il Moderato) of the libretto to Handel's L'Allegro, il Penseroso ed il Moderato:

As steals the morn upon the night,
And melts the shades away:
So Truth does Fancy's charm dissolve,
And rising Reason puts to flight
The fumes that did the mind involve,
Restoring intellectual day.

Involve = enfold, envelop, entangle (Oxford English Dictionary, sense 1).

Listen to the performance of Handel's aria by Amanda Forsythe and Thomas Cooley with Voices of Music.