If criticism is not free, then praise is meaningless. In a sense, the credibility of praise depends on the freedom of criticism. If we are in an environment where we cannot express our opinions freely, then regardless of the voice of praise How well expressed is not to let the public believe it is true, because the most authentic evaluation is always produced in a freely contestable speech environment. Once the institutional soil that guarantees the credibility of praise speech is missing, even if the praise really comes from the parties The true feelings will be greatly reduced. The most accurate summary of the main point of this text is:. ['Praise and criticism are a unity of contradictions.', 'True praise can achieve the best results.', 'Both criticism and praise require a free speech environment.', 'Being able to express criticism freely has true praise.']