Doing the same thing over and over again, expecting a different result is not a silly thing that silly people do. It's the correct thing that correct people do. It is the definition of practice. It's the definition of learning. It's the definition of moving forward. It's a noble, good, and valuable thing, and certainly not something to be laughed at. Just because everybody nods knowingly doesn't mean it's true. Just because lots of people say it, doesn't mean it's true.