What "seems" right to each person isn't enough to determine what actually "is" right. We don't just rely on appearances when we weigh things or measure them. We use scales and rulers instead. So why wouldn't there be a higher standard than what merely "seems" right? How could the most important matters in human life have no clear signs and be impossible to figure out? There must be some standard. So why don't we look for this standard, find it, and then stick to it completely? We shouldn't even lift a finger without using it. I think this standard, once we discover it, will cure the madness of people who rely only on what "seems" right and misuse that approach. Then we can start with clear, known principles and apply our sharpened understanding to specific situations.
What then "seems" to every man is not sufficient for determining what "is"; for neither in the case of weights nor measures are we satisfied with the bare appearance, but in each case we have discovered a certain rule. In this matter then is there no rule superior to what "seems"? And how is it possible that the most necessary things among men should have no sign (mark), and be incapable of being discovered? There is then some rule. And why then do we not seek the rule and discover it, and afterwards use it without varying from it, not even stretching out the finger without it? For this, I think, is that which when it is discovered cures of their madness those who use mere "seeming" as a measure, and misuse it; so that for the future proceeding from certain things (principles) known and made clear we may use in the case of particular things the preconceptions which are distinctly fixed.