"The machine should be able to make mistakes."

"The human mind is capable of doing many things that a machine cannot, but a machine can do many things that a human cannot."

"The whole problem can be reduced to the question: Can machines think?"

"We are not interested in the fact that the machine can do well, but in the fact that it can do badly."

"I have had a number of conversations with people who are convinced that machines cannot think. I have not been convinced by their arguments."