"L'instinct est une chose merveilleuse. Il ne peut ni être expliqué ni ignoré."

Simplified Meaning:

Sometimes, we just know things without having to think about them. This natural feeling or sense is called instinct. For example, when a person new to swimming suddenly knows they should move their arms and legs a certain way to stay afloat, that’s their instinct helping them. Instincts don't come from careful thinking; they are automatic and quick. You can't always explain why you feel a certain way or why you do something in a split second, like dodging a car that’s about to hit you. Even if you don’t fully understand these feelings, they are important and often help keep you safe or let you react in the right way. So, paying attention to these gut feelings can be a good idea because they often guide you well in tricky situations.