Quintilian, Training of the Orator 6.4.12

valet autem in altercatione plurimum acumen, quod sine dubio ex arte non venit – natura enim non docetur – arte tamen adiuvatur.

But the most powerful thing in debate is shrewdness; without a doubt this does not come from theoretical knowledge – for nature is not taught – but it is helped by theoretical knowledge.

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