"The mental evolution of the species proceeds apparently by regular progress side by side with the physical development until it comes to man, then there is a long, unexplained gulf. Somewhere man acquired an asset which sets him immeasurably apart from the other animals—his imagination. Out of it he created for himself a conscience, and clothes, and immodesty, and a hereafter, and a soul. I wonder where he got that asset. It almost makes one agree with Alfred Russel Wallace that the world and the universe were created just for his benefit, that he is the chief love and delight of God. Wallace says that the whole universe was made to take care of and to keep steady this little floating mote in the center of it, which we call the world. It looks like a good deal of trouble for such a small result; but it's dangerous to dispute with a learned astronomer like Wallace. Still, I don't think we ought to decide too soon about it—not until the returns are all in. There is the geological evidence, for instance. Even after the universe was created, it took a long time to prepare the world for man. Some of the scientists, ciphering out the evidence furnished by geology, have arrived at the conviction that the world is prodigiously old. Lord Kelvin doesn't agree with them. He says that it isn't more than a hundred million years old, and he thinks the human race has inhabited it about thirty thousand years of that time. Even so, it was 99,970,000 years getting ready, impatient as the Creator doubtless was to see man and admire him. That was because God first had to make the oyster. You can't make an oyster out of nothing, nor you can't do it in a day. You've got to start with a vast variety of invertebrates, belemnites, trilobites, jebusites, amalekites, and that sort of fry, and put them into soak in a primary sea and observe and wait what will happen. Some of them will turn out a disappointment; the belemnites and the amalekites and such will be failures, and they will die out and become extinct in the course of the nineteen million years covered by the experiment; but all is not lost, for the amalekites will develop gradually into encrinites and stalactites and blatherskites, and one thing and another, as the mighty ages creep on and the periods pile their lofty crags in the primordial seas, and at last the first grand stage in the preparation of the world for man stands completed; the oyster is done. Now an oyster has hardly any more reasoning power than a man has, so it is probable this one jumped to the conclusion that the nineteen million years was a preparation for him. That would be just like an oyster, and, anyway, this one could not know at that early date that he was only an incident in a scheme, and that there was some more to the scheme yet.
"The oyster being finished, the next step in the preparation of the world for man was fish. So the old Silurian seas were opened up to breed the fish in. It took twenty million years to make the fish and to fossilize him so we'd have the evidence later.
"Then, the Paleozoic limit having been reached, it was necessary to start a new age to make the reptiles. Man would have to have some reptiles —not to eat, but to develop himself from. Thirty million years were required for the reptiles, and out of such material as was left were made those stupendous saurians that used to prowl about the steamy world in remote ages, with their snaky heads forty feet in the air and their sixty feet of body and tail racing and thrashing after them. They are all gone now, every one of them; just a few fossil remnants of them left on this far-flung fringe of time.
"It took all those years to get one of those creatures properly constructed to proceed to the next step. Then came the pterodactyl, who thought all that preparation all those millions of years had been intended to produce him, for there wasn't anything too foolish for a pterodactyl to imagine. I suppose he did attract a good deal of attention, for even the least observant could see that there was the making of a bird in him, also the making of a mammal, in the course of time. You can't say too much for the picturesqueness of the pterodactyl —he was the triumph of his period. He wore wings and had teeth, and was a starchy-looking creature. But the progression went right along.
"During the next thirty million years the bird arrived, and the kangaroo, and by and by the mastodon, and the giant sloth, and the Irish elk, and the old Silurian ass, and some people thought that man was about due. But that was a mistake, for the next thing they knew there came a great ice-sheet, and those creatures all escaped across the Bering Strait and wandered around in Asia and died, all except a few to carry on the preparation with. There were six of those glacial periods, with two million years or so between each. They chased those poor orphans up and down the earth, from weather to weather, from tropic temperature to fifty degrees below. They never knew what kind of weather was going to turn up next, and if they settled any place the whole continent suddenly sank from under them, and they had to make a scramble for dry land. Sometimes a volcano would turn itself loose just as they got located. They led that uncertain, strenuous existence for about twenty-five million years, always wondering what was going to happen next, never suspecting that it was just a preparation for man, who had to be done just so or there wouldn't be any proper or harmonious place for him when he arrived, and then at last the monkey came, and everybody could see at a glance that man wasn't far off now, and that was true enough. The monkey went on developing for close upon five million years, and then he turned into a man—to all appearances.
"It does look like a lot of fuss and trouble to go through to build anything, especially a human being, and nowhere along the way is there any evidence of where he picked up that final asset—his imagination. It makes him different from the others—not any better, but certainly different. Those earlier animals didn't have it, and the monkey hasn't it or he wouldn't be so cheerful."
[Paine records Twain's thoughts in that magnificent essay: "Was the World Made for Man" published long after his death in the group of essays under the title "Letters from the Earth." There are minor additions in the published version: "coal to fry the fish"; and the remnants of life being chased from pole to pole "without a dry rag on them,"; and the "coat of paint" on top of the bulb on top the Eiffel Tower representing "man's portion of this world's history." Ed.]
He often held forth on the shortcomings of the human race—always a favorite subject—the incompetencies and imperfections of this final creation, in spite of, or because of, his great attribute—the imagination. Once (this was in the billiard-room) I started him by saying that whatever the conditions in other planets, there seemed no reason why life should not develop in each, adapted as perfectly to prevailing conditions as man is suited to conditions here. He said:
"Is it your idea, then, that man is perfectly adapted to the conditions of this planet?"
I began to qualify, rather weakly; but what I said did not matter. He was off on his favorite theme.