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Nequiquam sapit qui sibi non sapit.
He knows in vain who does not draw profit from what he knows

Casonova ascribes this quote to Cicero. He must be quoting from his memory, because the exact quote is a bit different:
Qui ipse sibi sapiens prodesse non quit, nequiquam sapit.
Also, Cicero himself is quoting from Ennius's Medea.
In the book, Casanova also mentioned these two mottos:
Excitat auditor studium, laudataque virtus
crescit, et immensum gloria calcar habet.
Having an audience makes one try harder, virtue grows by praise, and fame is a powerful spur
This one is from Ovid's "Epistulae ex Ponto." Another commonsense motto is also among Casanova's favorites, but he says that it would offend the vast number of thos who, whenever anything goes wrong for them, say: "It is not my fault":
Nemo leditur nisi a seipso
Nobody suffers except by his own doing