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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.What is iron logic?

So I take buying down as the core basis of trading. There is a limit to the decline of individual stocks in the short term, and when it reaches the limit, it will rise immediately. Therefore, grasping the limit decline of individual stocks and turning it into your own opportunity to enter the market can help you buy before the rise.What is iron logic?If it rises too much, it will fall, and if it falls too much, it will rise.