Quotes by Stephen Hawking Stephen Hawking 4 quotes The greatest enemy of knowledge is not ignorance. It is the illusion of knowledge. | #938 | | Save it ? 0 ⤫ Quiet people have the loudest minds. | #939 | | Save it ? 0 ⤫ I have noticed that even those who assert that everything is predestined and that we can change nothing about it still look both ways before they cross the street. | #940 | | Save it ? 0 ⤫ If time travel is possible, where are the tourists from the future? | #941 | | Save it ? 0