"Un homme qui porte un chat par la queue apprend quelque chose qu'il ne peut apprendre d'aucune autre façon."

Simplified Meaning:

When you do something risky or foolish, you experience things that you can't learn just by hearing about it or reading it. Imagine picking up a cat by its tail – the cat will scratch, bite, and fight back. You would quickly find out that it's a bad idea and remember the lesson forever because of the pain and struggle you went through. For example, if you touch a hot stove without knowing it’s hot, you will get burned. That burn teaches you to be careful around stoves in the future better than if someone just warned you about it. This kind of learning sticks with you because it’s intense and direct. So, when you make a mistake or take a big risk, you gain valuable knowledge from the experience that you couldn't get any other way. It's a reminder that some lessons in life need to be felt to be fully understood and remembered.