Then mounted, next, the base of sun and moon,
'Twixt earth and ether, in the midway air
Rolling their orbs; for into neither these
Could blend harmonious, since too light with earth
To sink deprest, while yet too ponderous far
To fly with ether toward the realms extreme:
So 'twixt the two they hovered; vital there
Moving forever, parts of the vast whole;
As move forever in the frame of man
Some active organs, while some oft repose. [802]