No More Learning

" So he inwardly began 970
On things for which no wording can be found;
Deeper and deeper sinking, until drown'd
Beyond the reach of music: for the choir
Of Cynthia he heard not, though rough briar
Nor           thicket interpos'd to dull
The vesper hymn, far swollen, soft and full,
Through the dark pillars of those sylvan aisles.