Out of sight? What of that?

Out of sight? What of that?
See the bird reach it!
Curve on curve, sweep on sweep,
Round the steep air.
Danger! What is that to her?
Better 'tis to fail there
Than debate here.

Blue is blue the world through,
Amber, amber; dew, dew.
Seek friend, and see—
Heaven is sky of earth
That's all—
Bashful Heaven, thy lovers small
Hide too, from thee.