Plato depicts Socrates as refuting sophists in several dialogues. These texts often depict the sophists in an unflattering light, and it is unclear how accurate or fair Plato's representation of them may be; however, Protagoras and Prodicus are portrayed in a largely positive light in "Protagoras." Protagoras argued that "man is the measure of all things", meaning man decides for himself what he is going to believe. The works of Plato and Aristotle have had much influence on the modern view of the "sophist" as a greedy instructor who uses rhetorical sleight-of-hand and ambiguities of language in order to deceive, or to support fallacious reasoning. In this view, the sophist is not concerned with truth and justice, but instead seeks power.