Ere quitting, for the nonce, the Sperm Whale's head, I would have you, as a sensible physiologist, simply --particularly remark its front aspect, in all its compacted collectedness
. I would have you investigate it now with the sole view of forming to yourself some unexaggerated, intelligent estimate of whatever battering-ram power may be lodged there.
It begets in those  who fall in with him at the right moment of their spiritual development, a habit of reading between the lines, a faith in the effect of concentration and collectedness
of mind on the right appreciation of poetry, the expectation that what is really worth having in the poetic order will involve, on their part, a certain discipline of the temper not less than of the intellect.
They must have been, and were, in the notes, as well as in the words of his wild fantasias (for he not unfrequently accompanied himself with rhymed verbal improvisations), the result of that intense mental collectedness
and concentration to which I have previously alluded as observable only in particular moments of the highest artificial excitement.