Final answer:
Aristotle's three forms of proof are ethos, logos, and pathos, concerning the speaker's credibility, logical arguments, and emotional appeal, respectively. Credibility includes honesty, being unbiased, and rational thinking.
Step-by-step explanation:
Aristotle's three forms of proof, fundamental to the art of persuasion, include ethos, logos, and pathos. Ethos refers to the speaker's credibility, logos to logical arguments, and pathos to emotional appeal. Within the aspect of credibility or ethos, Aristotle identifies three components: honesty, unbiased, and a rational approach that encompasses the source being well-informed and clearheaded. Trustworthiness also extends to the concept of an expert or authority, who is expected to provide presented facts, credible inferences, and avoid unsubstantiated opinions for a strong argument.