"My own view, which does not rely solely on religious faith or even on an original idea, but rather on ordinary common sense, is that establishing binding ethical principles is possible when we take as our starting point the observation that we all desire happiness and wish to avoid suffering."

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Our model of Nature should not be like a building-a handsome structure for the populace to admire, until in the course of time some one takes away a corner stone and the edifice comes toppling down. It should be like an engine with movable parts. We need not fix the position of any one lever; that is to be adjusted from time to time as the latest observations indicate. The aim of the theorist is to know the train of wheels which the lever sets in motion-that binding of the parts which is the soul of the engine.

— Arthur Eddington