"Earth is flat" is an objective statement. "I experience consciousness" is subjective, similarly to "I am experiencing pain". If someone tells me "pain doesn't

"Earth is flat" is an objective statement. "I experience consciousness" is subjective, similarly to "I am experiencing pain". If someone tells me "pain doesn't exist" while I know it exists (because I have experienced it), I can be certain that that person is wrong. Even though I can't prove it to him.