Against the Sophists (11-12)

For myself, I should have preferred above great riches that philosophy had as much power as these men claim; for, possibly, I should not have been the very last in the profession nor had the least share in its profits. But since it has no such power, I could wish that this prating might cease. For I note that the bad repute which results therefrom does not affect the offenders only, but that all the rest of us who are in the same profession share in the opprobium.[*]

But I marvel when I observe these men setting themselves up as instructors of youth who cannot see that they are applying the analogy of an art with hard and fast rules to a creative process. For, excepting these teachers, who does not know that the art of using letters remains fixed and unchanged, so that we continually and invariably use the same letters for the same purposes, while exactly the reverse is true of the art of discourse?[*] For what has been said by one speaker is not equally useful for the speaker who comes after him; on the contrary, he is accounted most skilled in this art who speaks in a manner worthy of his subject and yet is able to discover in it topics which are nowise the same as those used by others.