"The number of children born from educated parents is much too small."

"The problem of the 'thing in itself' is not a problem that can be solved by science. It is a philosophical problem."

"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."

"The world is much stranger than we can imagine."

"God's existence or non-existence, and the validity of moral laws, are not matters for scientific inquiry."