Free speech is one of the most important democratic and academic values, essential to sharing knowledge and one’s own perspective without negative reprisal. Truth is best reached through open debate among different views and methodologies, because truth is always a sum of various perspectives. At the university, free speech means openly sharing research questions and methods, and views that need not match those of the authorities, and being able to group into units around shared views. Teaching should present all perspectives, not the professor’s private opinions. The limit is methodological — what cannot be defined as knowledge- or research-based does not count as academic content — but otherwise people should speak freely, and the best interruption is showing your own argument, enriching everyone toward the goal of critical thinking.