The document discusses the difference between opinions and truths. Opinions are personal beliefs or judgments that may not be based on facts, while truths are statements that can be proven with evidence or facts. It provides examples to illustrate the difference, such as the statement "no bird has no wings" being a truth while "my friend is the best" being an opinion. The document emphasizes that as philosophers, we should not assume all statements are true and instead analyze and investigate claims to determine the truth through reasoning and evidence.