Institutio Oratoria

Quintilian

Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.

But geometry soars still higher to the consideration of the system of the universe: for by its calculations it demonstrates the fixed and ordained courses of the stars, and thereby we acquire the knowledge that all things are ruled by order and destiny, a consideration which may at times be of value to an orator.

When

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Pericles dispelled the panic caused at Athens by the eclipse of the sun by explaining the causes of the phenomenon, or Sulpicius Gallus discoursed on the eclipse of the moon to the army of Lucius Paulus to prevent the soldiers being seized with terror at what they regarded as a portent sent by heaven, did not they discharge the function of an orator?

If Nicias had known this when he commanded in Sicily, he would not have shared the terror of his men nor lost the finest army that Athens ever placed in the field. Dion for instance when he came to Syracuse to overthrow the tyranny of Dionysius, was not frightened away by the occurrence of a similar phenomenon. However we are not concerned with the uses of geometry in war and need not dwell upon the fact that Archimedes singlehanded succeeded in appreciably prolonging the resistance of Syracuse when it was besieged.