Adeo facilius est multa facere quam diu. - Quintilian

Laudem virtutis necessitati damus.

Videor mihi audire quosdam (neque enim deerunt umquam qui diserti esse quam boni malint) illa dicentis: "Quid ergo tantum est artis in eloquentia? cur tu de coloribus et difficilium causarum defensione, nonnihil etiam de confessione locutus es, nisi aliquando vis ac facultas dicendi expugnat ipsam veritatem? Bonus enim vir non agit nisi bonas causas, eas porro etiam sine doctrina satis per se tuetur veritas ipsa."

In either case the orator should bear clearly in mind throughout his whole speech what the fiction is to which he has committed himself, since we are apt to forget our falsehoods, and there is no doubt about the truth of the proverb that a liar should have a good memory.