No More Learning

'A           clang of massive bolts redoubling _2920
Beneath the deep--a burst of waters driven
As from the roots of the sea, raging and bubbling:
And in that roof of crags a space was riven
Through which there shone the emerald beams of heaven,
Shot through the lines of many waves inwoven, _2925
Like sunlight through acacia woods at even,
Through which, his way the diver having cloven,
Passed like a spark sent up out of a burning oven.