Whence is that veering spirit of the sky

"WHENCE is that veering spirit of the sky,
"Whose secret form eludes the human eye;
"Who now, unmindful of its matchless pow'r
"Indulgent whispers to the vernal flow'r,
"Plays with her leaves, and hov'ring o'er her bloom
"From her young breast allures the enclos'd perfume:
"And now; envelop'd in a sullen mood,
"Tempestuous rushes on the groaning wood;
"Arm'd with destructive energy, invades,
"Despoils, devasts the consecrated shades?"