If Thou Indeed Derive Thy Light from Heaven

If thou indeed derive thy light from Heaven,
Then, to the measure of that heaven-born light,
Shine, Poet! in thy place, and be content:--
The stars pre-eminent in magnitude,
And they that from the zenith dart their beams,
(Visible though they be to half the earth,
Though half a sphere be conscious of their brightness)
Are yet of no diviner origin,
No purer essence, than the one that burns,
Like an untended watch-fire, on the ridge
Of some dark mountain; or than those which seem
Humbly to hang, like twinkling winter lamps,
Among the branches of the leafless trees;
All are the undying offspring of one Sire:
Then, to the measure of the light vouchsafed,
Shine, Poet! in thy place, and be content.