[T]he passage from the physics of the brain to the corresponding facts of consciousness is unthinkable. Granted that a definite thought and a definite molecular action in the brain occur simultaneously; we do not possess the intellectual organ, nor apparently any rudiment of the organ, which would enable us to pass, by a process of reasoning, from one to the other.”
John Tyndall on the hard problem of consciousness in the “Belfast Address”. Quoted by Galen Strawson in “Consciousness myth”, Times Literary Supplement.