"Earth's crammed with heaven"

I came across this quote when finishing up reading “The Shack” by Young (Here's a quick review of the book). It is from Elizabeth Browning’s Aurora Leigh:

“And truly, I reiterate, . . nothing’s small!
No lily-muffled hum of a summer-bee,
But finds a coupling with the spinning stars;
No pebble at your foot, but proves a sphere;
No chaffinch, but implies the cherubim:
And,-glancing on my own thin, veined wrist,-
In such a little tremour of the blood
The whole strong glamour of a vehement soul
Doth utter itself distinct. Earth’s crammed with heaven,
And every common bush afire with God:
But only he who sees, takes off his shoes,
The rest sit round and pick blackberries,
And daub their natural faces unaware
More and more from the first similitude.”