"The problem of consciousness is the most difficult problem in science."

"The great difficulty for our contemporary way of thinking is that we must recognize the identity of the experiencing and the experienced subject."

"The human mind is a universe in itself."

"I am very astonished that the scientific picture of the real world around me is very deficient. It gives a lot of factual information, puts all our experience in a magnificently consistent order, but …"

"Consciousness is a singular of which the plural is unknown; that there is only one thing and that what seems to be a plurality is merely a series of different aspects of this one thing."