"Respectez l'action des prix et ne combattez jamais la tendance."

Simplified Meaning:

This quote is giving advice on how to handle market trends and stock movements. It tells us to accept what we see happening in the market without trying too hard to go against it. For example, if you notice that the price of a stock is constantly going up, it might be wise to follow this trend rather than betting it will suddenly drop. Markets show patterns and signals through prices and behaviors; ignoring these clues can lead to poor decisions and losses. Imagine you're swimming in a river. If you swim with the current, it's easier and safer. Swimming against it would take a lot more effort and could be dangerous. In the stock market, going with the flow of how stocks are moving is like swimming with the current – it often leads to better outcomes. So, this quote is advising people to observe and respect market movements instead of stubbornly contradicting them.