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The capacity to disagree strongly with another person about issues, including significant ones, while maintaining civility and respecting their right to hold a different view than you, even if you are convinced it is false.
This is my preferred definition of tolerance, rather than the one that many people seem to employ. Today, tolerance for many people means something like all views are equally valid, and that it is arrogant to think that you have the correct view about something, at least when it comes to politics, ethics, or religion. The problem with this contemporary view of tolerance is that all views about politics, ethics, or religion are not equally valid. This is not only a matter of logic, given that some views in these realms are contradictory, but it is also a matter of truth, because some views are more accurate than others.