"The first thing to say is that of course I don't believe in the existence of 'my' cat, or 'your' cat, or 'the' cat. There is only one cat, which is the cat of the universe. And it's not even a cat, it…"

"The scientist's world-picture is of course not the only possible one. It is not even a complete one. It is just one, an important one, but it is not the whole truth."

"The reason why our sentient, percipient and thinking ego is met nowhere within our scientific world picture can easily be indicated in seven words: because it is itself that world picture."

"I insist upon the view that 'all is waves'."

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