There’s an (Ancient) Book for Everything

While writing a treatise for king Louis IX of France in 1259, advising him how a Christian ruler ought to behave, the Franciscan friar Guibert de Tournai pens a lyrical passage explaining the value of books and the knowledge and examples they provide:

“If the king who sits on the throne of judgement is hard pressed to disperse evil by his look,* it is necessary for him to know the sacred writings [i.e. Scripture]. By these the kingdom is ruled, and from these legitimate laws are derived.

“For if the commonwealth is to be ruled, if battles engaged, if fortifications measured, if engines erected, if ramparts restored, if bulwarks made; if the calm of liberty, the cultivation of justice, reverence for laws, and the friendships of neighbouring peoples are to be preserved, books teach all these things for their achievement.

“For who would not have Vegetius, if arranging to protect or besiege castles or cities? Palladius plants, Vitruvius builds, Euclid measures, Socrates classifies, Plato explicates, Aristotle complicates, Aeschines soothes, Demosthenes enrages, Cato persuades, Appius dissuades, and Cicero convinces. From these together is modelled a way of speaking, and within them are sometimes given examples of living.”

Eruditio regum et principum, II.ii.5

* cf. Prov. 20:8
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