"No matter how hard you try to teach your cat general relativity, you're going to fail"

In this quote, Brian Greene is utilizing an amusing analogy to communicate the concept that some things are just difficult to achieve. The idea of teaching a cat general relativity, a complex theory in physics, is absurd and highlights the futility of trying the difficult. It suggests that no matter just how much effort or decision one takes into a job, there are specific constraints that can not be conquered. This quote works as a reminder to accept our restrictions and focus on achievable goals, instead of wasting time and energy on unattainable ones. It also highlights the significance of understanding and accepting the boundaries of our capabilities.