Analysis of Lines from Endymion

A thing of beauty is a joy for ever:
Its loviliness increases; it will never
Pass into nothingness; but still will keep
A bower quiet for us, and a sleep
Full of sweet dreams, and health, and quiet breathing.
Therefore, on every morrow, are we wreathing
A flowery band to bind us to the earth,
Spite of despondance, of the inhuman dearth
Of noble natures, of the gloomy days,
Of all the unhealthy and o`er-darkened ways
Made for our searching: yes, inspite of all,
Some shape of beauty moves away the pall
From our dark spirits.