The ancients considered mechanics in a twofold respect; as rational, which proceeds accurately by demonstration, and practical. To practical mechanics all the manual arts belong, from which mechanics took its name. But as artificers do not work with perfect accuracy, it comes to pass that mechanics is so distinguished from geometry, that what is perfectly accurate is called geometrical; what is less so is called mechanical. But the errors are not in the art, but in the artificers. He that works with less accuracy is an imperfect mechanic: and if any could work with perfect accuracy, he would be the most perfect mechanic of all; for the description of right lines and circles, upon which geometry is founded, belongs to mechanics. Geometry does not teach us to draw these lines, but requires them to be drawn; for it requires that the learner should first be taught to describe these accurately, before he enters upon geometry; then it shows how by these operations problems may be solved.
 
    
        Isaac Newton 
     
    
     
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        It would be difficult to describe the subtle brotherhood of men that was here established on the seas. No one said that it was so. No one mentioned it. But it dwelt in the boat, and each man felt it warm him. They were a captain, an oiler, a cook, and a correspondent, and they were friends, friends in a more curiously iron-bound degree than may be common. The hurt captain, lying against the water-jar in the bow, spoke always in a low voice and calmly, but he could never command a more ready and swiftly obedient crew than the motley three of the dingey. It was more than a mere recognition of what was best for the common safety. There was surely in it a quality that was personal and heartfelt. And after this devotion to the commander of the boat there was this comradeship that the correspondent, for instance, who had been taught to be cynical of men, knew even at the time was the best experience of his life. But no one said that it was so. No one mentioned it. 
         
 
    Stephen Crane 
 
                 
            
        
     
    
    
    
    
                                        
                    
    
        What were they saying?” Daly asked.
"They disapprove of your profession,” Doro told him.
"Heathen savages,” Daly muttered. "They're like animals. They're all cannibals.”
"These aren't,” Doro said, "though some of the their neighbors are.”
"All of them,” Daly insisted. "Just give them the chance.”
Doro smiled. "Well, no doubt the missionaries will reach them eventually and teach them to practice only symbolic cannibalism.”
Daly jumped. He considered himself a pious man in spite of his work. "You shouldn't say such things,” he whispered. "Not even you are beyond the reach of God.”
"Spare me your mythology,” Doro said, "and your righteous indignation.” Daly had been Doro's man too long to be pampered in such matters. "At least we cannibals are honest about what we do,” Doro continued. "We don't pretend as your slavers do to be acting for the benefit of our victims' souls. We don't tell ourselves we've caught them to teach them civilized religion. 
         
 
    Octavia Butler 
 
                 
            
        
     
    
    
    
    
                                        
                    
    
        In the last centuries of the empire, educational standards and literacy had fallen. In the dulled heads of the masses, distracted by cheap food and the barbaric spectacles of the coliseums, the values on which Rome had been founded and the ancient rationalism of the Greeks had been replaced by mysticism and superstition. It was-Honorius had explained to his pupil-as if a whole culture was losing its mind. People were forgetting how to think, and soon they would forget they had forgotten. And, to Honorius's thinking, Christianity only exacerbated that problem.
"You know, Augustine warned us that belief in the old myths was fading-even a century and a half ago, as the dogma of the Christians took root. And with the loss of the myths, so vanishes the learning of a thousand years, which are codified in those myths, and the monolithic dogmas of the Church will snuff out rational inquiry for ten more centuries. The light is fading, Athalric.”. 
         
 
    Stephen Baxter