To attach something to the piston-rod to be moved by it, was a simple matter--crank and wheel. And so there was a working engine. 
One by one, improvements were discovered by men who used their eyes, not their creating powers--for they hadn't any--and now, after a hundred years the patient contributions of fifty or a hundred observers stand compacted in the wonderful machine which drives the ocean liner.
Y.M. A Shakespearean play?
O.M. The process is the same. The first actor was a savage. He reproduced in his theatrical war-dances, scalp- dances, and so on, incidents which he had seen in real life. A more advanced civilization produced more incidents, more episodes; the actor and the story-teller borrowed them. And so the drama grew, little by little, stage by stage. It is made up of the facts of life, not creations. It took centuries to develop the Greek drama. It borrowed from preceding ages; it lent to the ages that came after. Men observe and combine, that is all. So does a rat.
O.M. He observes a smell, he infers a cheese, he seeks and finds. The astronomer observes this and that; adds his this and that to the this-and-thats of a hundred predecessors, infers an invisible planet, seeks it and finds it. The rat gets into a trap; gets out with trouble; infers that cheese in traps lacks value, and meddles with that trap no more. The astronomer is very proud of his achievement, the rat is proud of his. Yet both are machines; they have done machine work, they have originated nothing, they have no right to be vain; the whole credit belongs to their Maker. They are entitled to no honors, no praises, no monuments when they die, no remembrance. One is a complex and elaborate machine, the other a simple and limited machine, but they are alike in principle, function, and process, and neither of them works otherwise than automatically, and neither of them may righteously claim a PERSONAL superiority or a personal dignity above the other.
Y.M. In earned personal dignity, then, and in personal merit for what he does, it follows of necessity that he is on the same level as a rat?
O.M. His brother the rat; yes, that is how it seems to me. Neither of them being entitled to any personal merit for what he does, it follows of necessity that neither of them has a right to arrogate to himself (personally created) superiorities over his brother.
Y.M. Are you determined to go on believing in these insanities? Would you go on believing in them in the face of able arguments backed by collated facts and instances?
O.M. I have been a humble, earnest, and sincere Truth-Seeker.
Y.M. Very well?
O.M. The humble, earnest, and sincere Truth-Seeker is always convertible by such means.
Y.M. I am thankful to God to hear you say this, for now I know that your conversion--
O.M. Wait. You misunderstand. I said I have BEEN a Truth-Seeker.
O.M. I am not that now. Have your forgotten? I told you that there are none but temporary Truth-Seekers; that a permanent one is a human impossibility; that as soon as the Seeker finds what he is thoroughly convinced is the Truth, he seeks no further, but gives the rest of his days to hunting junk to patch it and caulk it and prop it with, and make it weather-proof and keep it from caving in on him. Hence the Presbyterian remains a Presbyterian, the Mohammedan a Mohammedan, the Spiritualist a Spiritualist, the Democrat a Democrat, the Republican a Republican, the Monarchist a Monarchist; and if a humble, earnest, and sincere Seeker after Truth should find it in the proposition that the moon is made of green cheese nothing could ever budge him from that position; for he is nothing but an automatic machine, and must obey the laws of his construction.
Y.M. After so--
O.M. Having found the Truth; perceiving that beyond question man has but one moving impulse--the contenting of his own spirit-- and is merely a machine and entitled to no personal merit for anything he does, it is not humanly possible for me to seek further. The rest of my days will be spent in patching and painting and puttying and caulking my priceless possession and in looking the other way when an imploring argument or a damaging fact approaches.