Aristotle

A statement is persuasive and credible either because it is directly self-evident or because it appears to be proved from other statements that are so.
A statement is persuasive and credible either because it is directly self-evident or because it appears to be proved from other statements that are so.
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appear  credible  directly  

These are some quotes by Greek author Aristotle Philosopher, who lived between 384 BC and 322 BC.