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It really comes down to parsimony, economy of explanation. It is possible that your car engine is driven by psychokinetic energy, but if it looks like a petrol engine, smells like a petrol engine and performs exactly as well as a petrol engine, the sensible working hypothesis is that it is a petrol engine.

 

Richard Dawkins

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God made us: invented us as a man invents an engine. A car is made to run on petrol, and it would not run properly on anything else. Now God designed the human machine to run on Himself.

 

C. S. Lewis

 

And then we come to the physics engine. Oh, the physics engine, for which so much praise has been sung. What they say is all true. It is fantastic the way you can pick up boxes, the way they fall, the way they tip over, the way they smash into bits when you hit them. (On Half-Life 2, 26 November 2004)

 

Ben Croshaw

 

It is absolutely critical that we understand this is not just a challenge, it's an opportunity, because if we create a new energy economy, we can create five million new jobs, easily, here in the United States.
It can be an engine that drives us into the future the same way the computer was the engine for economic growth over the last couple of decades.
And we can do it, but we're going to have to make an investment. The same way the computer was originally invented by a bunch of government scientists who were trying to figure out, for defense purposes, how to communicate, we've got to understand that this is a national security issue, as well.
And that's why we've got to make some investments and I've called for investments in solar, wind, geothermal.

 

Barack Obama

 

The power which a man's imagination has over his body to heal it or make it sick is a force which none of us is born without. The first man had it, the last one will possess it. If left to himself, a man is most likely to use only the mischievous half of the force—the half which invents imaginary ailments for him and cultivates them; and if he is one of these—very wise people, he is quite likely to scoff at the beneficent half of the force and deny its existence. And so, to heal or help that man, two imaginations are required: his own and some outsider's. The outsider, B, must imagine that his incantations are the healing-power that is curing A, and A must imagine that this is so. I think it is not so, at all; but no matter, the cure is effected, and that is the main thing. The outsider's work is unquestionably valuable; so valuable that it may fairly be likened to the essential work performed by the engineer when he handles the throttle and turns on the steam; the actual power is lodged exclusively in the engine, but if the engine were left alone it would never start of itself. Whether the engineer be named Jim, or Bob, or Tom, it is all one—his services are necessary, and he is entitled to such wage as he can get you to pay. Whether he be named Christian Scientist, or Mental Scientist, or Mind Curist, or King's-Evil Expert, or Hypnotist, it is all one; he is merely the Engineer; he simply turns on the same old steam and the engine does the whole work.

 

Mark Twain

 

The power which a man's imagination has over his body to heal it or make it sick is a force which none of us is born without. The first man had it, the last one will possess it. If left to himself, a man is most likely to use only the mischievous half of the force—the half which invents imaginary ailments for him and cultivates them; and if he is one of these—very wise people, he is quite likely to scoff at the beneficent half of the force and deny its existence. And so, to heal or help that man, two imaginations are required: his own and some outsider's. The outsider, B, must imagine that his incantations are the healing-power that is curing A, and A must imagine that this is so. I think it is not so, at all; but no matter, the cure is effected, and that is the main thing. The outsider's work is unquestionably valuable; so valuable that it may fairly be likened to the essential work performed by the engineer when he handles the throttle and turns on the steam; the actual power is lodged exclusively in the engine, but if the engine were left alone it would never start of itself. Whether the engineer be named Jim, or Bob, or Tom, it is all one—his services are necessary, and he is entitled to such wage as he can get you to pay. Whether he be named Christian Scientist, or Mental Scientist, or Mind Curist, or King's-Evil Expert, or Hypnotist, it is all one; he is merely the Engineer; he simply turns on the same old steam and the engine does the whole work.

 

Samuel Langhorne (Mark Twain) Clemens