"إذا كنت تعتقد أنك تفهم ميكانيكا الكم، فأنت لا تفهم ميكانيكا الكم"

Simplified Meaning:

Quantum mechanics is a part of science that studies really tiny particles, like atoms and electrons, and how they behave. This area of science is very strange and doesn't follow the normal rules that we're used to in everyday life. The quote means that even experts in this field find it confusing and surprising. For example, imagine if someone claimed to fully understand how dreams work. Since dreams are still a big mystery and have many unknowns, saying that would show they probably don’t realize how complex dreams are. Similarly, quantum mechanics is so confusing that if someone thinks they understand it completely, they probably haven’t grasped its real complexity. For regular people, this teaches us that some things in life are too complicated to understand entirely, and it's okay to accept that some knowledge remains a mystery. So, if you're trying to learn something difficult and it feels confusing, remember that even the smartest people often don’t have all the answers.