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What is iron logic?What is the only certainty in countless changes?

What is the only certainty in countless changes?What is iron logic?

If it rises too much, it will fall, and if it falls too much, it will rise.If you feel unconvinced, you can buy stocks on the same day as me and send them out on the same day, so that everyone can see for themselves whether they have risen or not, instead of deceiving everyone with your poor P-chart, or satisfying your pathetic vanity of losing money every day to find a sense of existence.What is the only certainty in countless changes?