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Of the bodies in the cosmos, some imitate mind and move in orbits; some imitate soul and move in a straight line, fire and air upward, earth and water downward.
--
VII. On the Nature of the World and its Eternity.

 

Sallustius (or Sallust)

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Bodies like the earth are not made to move on curved orbits by a force called gravity; instead, they follow the nearest thing to a straight path in a curved space, which is called a geodesic. A geodesic is the shortest (or longest) path between two nearby points.

 

Stephen Hawking

 

I tell you that if natural bodies have it from Nature to be moved by any movement, this can only be circular motion, nor is it possible that Nature has given to any of its integral bodies a propensity to be moved by straight motion. I have many confirmations of this proposition, but for the present one alone suffices, which is this. I suppose the parts of the universe to be in the best arrangement, so that none is out of its place, which is to say that Nature and God have perfectly arranged their structure. This being so, it is impossible for those parts to have it from Nature to be moved in straight, or in other than circular motion, because what moves straight changes place, and if it changes place naturally, then it was at first in a place preternatural to it, which goes against the supposition. Therefore, if the parts of the world are well ordered, straight motion is superfluous and not natural, and they can only have it when some body is forcibly removed from its natural place, to which it would then return by a straight line, for thus it appears that a part of the earth does [move] when separated from its whole. I said "it appears to us," because I am not against thinking that not even for such an effect does Nature make use of straight line motion.

 

Galileo Galilei

 

How could one argue with a man who was always drawing lines and circles to explain the position; who, one day, drew a diagram [here Michael illustrated with pen and paper] saying 'take a point A, draw a straight line to point B, now three-fourths of the way up the line take a point C. The straight line AB is the road to the Republic; C is where we have got to along the road, we canot move any further along the straight road to our goal B; take a point out there, D [off the line AB]. Now if we bend the line a bit from C to D then we can bend it a little further, to another point E and if we can bend it to CE that will get us around Cathal Brugha which is what we want!' How could you talk to a man like that?

 

Eamon de Valera

 

Hermes addressed Marcus and said, "and you, Verus, what did you think the noblest ambition in life?" In a low voice he answered modestly, "To imitate the gods." This answer they at once agreed was highly noble and in fact the best possible. And even Hermes did not wish to cross-examine him further, since he was convinced that Marcus would answer every question equally well.
The other gods were of the same mind; only Silenus cried "By Dionysus I shall not let this sophist off so easily. Why then did you eat bread and drink wine and not ambrosia and nectar like us?" "Nay," he replied "it was not in the fashion of my meat and drink that I thought to imitate the gods. But I nourished my body because I believed, though perhaps falsely, that even your bodies require to be nourished by the fumes of sacrifice. Not that I supposed I ought to imitate you in that respect, but rather your minds."
For the moment Silenus was at a loss as though he had been hit by a good boxer, then he said: "There is perhaps something in what you say; but now tell me what did you think was really meant by 'imitating the gods.'"
"Having the fewest possible needs, and doing good to the greatest possible number."

 

Julian (Emperor)

 

If the earth were not round, heavy bodies would not tend from every side in a straight line towards the center of the earth, but to different points from different sides.

 

Johannes Kepler