Food establishments must include firm commitments to food safety in their codes of ethics, always putting food safety above financial concerns. This includes going beyond the letter of the law to enforce the highest quality standards of products. Health workers have a duty to refrain from mistreating, minimizing harm and promoting good for patients. This particular duty of treatment describes beneficence.
Healthcare workers demonstrate this by providing a balance between benefits and risks for the patient. Helping patients with tasks they can't do on their own, keeping railings up to prevent falls, or providing them with medications in a quick and timely manner are examples of charity. The environment in which we all work is subject to rapid and continuous changes, with advances in technology, increased competition, diversification of groups and differences between generations. Therefore, the Principles are intended to serve as a lasting framework in which those involved in professional development and employment processes operate and as a basis on which professionalism and ethical behavior are promoted.
NACE members are expected to use the Principles to guide processes, decisions and results. NACE staff can answer many questions about the NACE Principles for Ethical Professional Practice; for more complex issues that require an advisory opinion, staff can refer their question to the NACE Principles Committee. The contradiction is, then, that if it is possible for an expert speaker to do evil (by generating a false belief about good), then given (, he has no knowledge of good (otherwise he could not do evil). This lack of knowledge does not prevent them from mastering the art of oratory and rhetoric (thanks to this mastery they have the ability to do evil in the first place), contradicting (and, therefore, either oratory and rhetoric do not refer to good and evil, or they are not arts at all (they don't care about knowledge).
Socrates, in the next conversation with Polus, will make this second statement.