For we Academicians are not men whose minds wander in uncertainty and never know what principles to adopt.
 Marcus Tullius Cicero, On Duties (44 BC). copy citation

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Author Marcus Tullius Cicero
Source On Duties
Topic uncertainty mind
Date 44 BC
Language English
Reference
Note Translated by Walter Miller
Weblink http://www.constitution.org/rom/de_officiis.htm

Context

“{7} But people raise other objections against me — and that, too, philosophers and scholars — asking whether I think I am quite consistent in my conduct — for although our school maintains that nothing can be known for certain, yet, they urge, I make a habit of presenting my opinions on all sorts of subjects and at this very moment am trying to formulate rules of duty. But I wish that they had a proper understanding of our position. For we Academicians are not men whose minds wander in uncertainty and never know what principles to adopt. For what sort of mental habit, or rather what sort of life would that be which should dispense with all rules for reasoning or even for living? Not so with us; but, as other schools maintain that some things are certain, others uncertain, we, differing with them, say that some things are probable, others improbable.” source