"If someone says that he can think or talk about quantum physics without becoming dizzy, that shows only that he has not understood anything whatever about it"

This quote by Murray Gell-Mann is a tip that quantum physics is a complex and hard subject to understand. It recommends that if somebody claims to be able to believe or speak about quantum physics without ending up being overloaded or confused, then they have not genuinely grasped the idea. Gell-Mann is highlighting the intricacy of quantum physics and the need to have a deep understanding of the subject in order to be able to discuss it. He is also suggesting that it is not possible to have a superficial understanding of quantum physics and still be able to discuss it. This quote works as a pointer that quantum physics is a difficult subject to comprehend and requires a great deal of effort and devotion to truly comprehend.