"But lastly, as in building, if the line Be not exact and straight, the rule decline, Or level false, how vain is the design! Uneven, an ill-shap'd and tottering wall Must rise; this part must sink, that part must fall, Because the rules were false that fashion'd all; Thus reason's rules are false if all commence And rise from failing and from erring sense."
Falsaque sit, falsis quæcumque a sensibus orta est.