But many people are fooled by the same thing that fooled the speaker Theopompus when he criticized Plato for wanting to define everything. What does Theopompus say? "Did none of us use the words 'good' or 'just' before you came along? Were we just making empty sounds without knowing what they meant?" But Theopompus, who says we didn't have natural ideas about these things already? Of course we did. But you can't use your basic ideas properly if you haven't thought them through clearly and figured out what exactly each idea applies to. You could make the same complaint about doctors. Who among us didn't use the words "healthy" and "unhealthy" before Hippocrates lived? Were we just making empty sounds? We do have a basic idea of what health is, but we can't apply it correctly. That's why one doctor says "Don't eat," another says "Eat more," another says "Bleed the patient," and another says "Use cupping." Why does this happen? Because they can't properly connect their basic idea of health to specific cases.
But the many are deceived by this which deceived also the rhetorician Theopompus, when he blames even Plato for wishing everything to be defined. For what does he say? Did none of us before you use the words good or just, or do we utter the sounds in an unmeaning and empty way without understanding what they severally signify? Now who tells you, Theopompus, that we had not natural notions of each of these things and preconceptions ([Greek: prolaepseis])? But it is not possible to adapt preconceptions to their correspondent objects if we have not distinguished (analyzed) them, and inquired what object must be subjected to each preconception. You may make the same charge against physicians also. For who among us did not use the words healthy and unhealthy before Hippocrates lived, or did we utter these words as empty sounds? For we have also a certain preconception of health, but we are not able to adapt it. For this reason one says, Abstain from food; another says, Give food; another says, Bleed; and another says, Use cupping. What is the reason? is it any other than that a man cannot properly adapt the preconceptions of health to particulars?