Why must we apply Aristotle's dictum when using the internal test?

Aristotle's dictum emphasizes the importance of coherence and consistency in evaluating arguments and texts. When applying the internal test, which assesses the internal consistency and logical structure of a text, Aristotle's principle helps ensure that contradictions are identified and resolved. This approach strengthens the overall credibility and reliability of the text, as it aligns with the fundamental principles of sound reasoning. By adhering to this dictum, we can better discern the authenticity and integrity of the material being examined.