[164b]
makes a helpful result both for himself and for the person whom he cures.
I do.
And he who does this does his duty?
Yes.
Is not he who does his duty temperate?
Indeed he is.
Well, and must the doctor know when his medicine will be helpful, and when not? And must every craftsman know when he is likely to be benefited by the work he does, and when not?
Probably not.
Then sometimes, I went on, the doctor may have done what is helpful
