Read mark twain's "two ways of seeing a river." what claim does twain make in this persuasive essay?

"all the grace, the beauty, the poetry, had gone out of the majestic river! i still kept in mind a certain wonderful sunset which i witnessed when steamboating was new to me. a broad expanse of the river was turned to blood; in the middle distance the red hue brightened into gold, through which a solitary log came floating, black and conspicuous; in one place a long, slanting mark lay sparkling upon the water; in another the surface was broken by boiling, tumbling rings that were as many-tinted as an opal; where the ruddy flush was faintest was a smooth spot that was covered with graceful circles and radiating lines, ever so delicately traced; the shore on our left was densely wooded, and the somber shadow that fell from this forest was broken in one place by a long, ruffled trail that shone like silver; and high above the forest wall a clean-stemmed dead tree waved a single leafy bough that glowed like a flame in the unobstructed splendor that was flowing from the sun. there were graceful curves, reflected images, woody heights, soft distances, and over the whole scene, far and near, the dissolving lights drifted steadily, enriching it every passing moment with new marvels of coloring.

i stood like one bewitched. i drank it in, in a speechless rapture. the world was new to me and i had never seen anything like this at home. but as i have said, a day came when i began to cease from noting the glories and the charms which the moon and the sun and the twilight wrought upon the river’s face; another day came when i ceased altogether to note them. then, if that sunset scene had been repeated, i should have looked upon it without rapture and should have commented upon it inwardly after this fashion: "this sun means that we are going to have wind tomorrow; that floating log means that the river is rising, small to it; that slanting mark on the water refers to a bluff reef which is going to kill somebody's steamboat one of these nights, if it keeps on stretching out like that; those tumbling 'boils' show a dissolving bar and a changing channel there; the lines and circles in the slick water over yonder are a warning that that troublesome place is shoaling up dangerously; that silver streak in the shadow of the forest is the 'break' from a new snag and he has located himself in the very best place he could have found to fish for steamboats; that tall dead tree, with a single living branch, is not going to last long, and then how is a body ever going to get through this blind place at night without the friendly old landmark? "

no, the romance and beauty were all gone from the river. all the value any feature of it had for me now was the amount of usefulness it could furnish toward compassing the safe piloting of a steamboat. "

-understanding the river currents can you to better appreciate nature.
-knowledge and experience you understand the value of nature.
-knowledge and experience changes your perspective toward life.
-appreciating natural beauty enhances your perspective toward life.
-understanding that a river is not all about romance and beauty makes you wise.

only one.