It is beyond serious doubt that conscious experience is wholly a matter of brain activity, but this doesn’t show us that we don’t know what consciousness is. It shows us that we don’t know what matter is. The hard problem is the problem of matter. Matter is even more extraordinary than we thought, as physicists have been demonstrating for a long time.

– Galen Strawson in a letter to the Economist, October 3, 2015, p. 20. Note: You can see my interest in this topic in my sermon “The Mystery of Consciousness."