While it is all very well to distinguish happiness that is transient from that which is lasting, between ephemeral and genuine happiness, the only happiness it is meaningful to speak of when a person is dying from thirst is access to water.
Now when I had mastered the language of this water, and had come to know every trifling feature that bordered the great river as familiarly as I knew the letters of the alphabet, I had made a valuable acquisition. But I had lost something, too. I had lost something which could never be restored me while I lived. All the grace, the beauty, the poetry, had gone out of the majestic river!
Private courts, Gloomy as coffins, and unsightly lanes Thrilled by some female vendor's scream, belike The very shrillest of all London cries, May then entangle our impatient steps; Conducted through those labyrinths, unawares, To privileged regions and inviolate, Where from their airy lodges studious lawyers Look out on waters, walks, and gardens green.
You cannot lecture on really pure poetry any more than you can talk about the ingredients of pure water-it is adulterated, methylated, sanded poetry that makes the best lectures.