The reason is the most trusted tool when people need to make sound judgments to decide how to act in complex situations. Irrational tools such as hunch and habit are often used, but when it matters, or When success or failure depends on the point of judgment, it is undoubtedly the easiest way to succeed by resorting to rationality. We already have some reasonable methods that have been tested for a long time and can be used to determine which is appropriate and which is true. We also have a series of Established principles that can guide us to derive inferences from what is already known. What does the text mean? ['The reason is the most reliable tool for people to make judgments.', 'A set of methods already exists to help people make sound judgments.', 'Irrational tools cannot be trusted when people need to make sound judgments.', 'The judgment of complex situations based on rationality is not wrong.']