explain cryptocurrency Knowledge

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.If it rises too much, it will fall, and if it falls too much, it will rise.

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.If it rises too much, it will fall, and if it falls too much, it will rise.What is iron logic?