“Women. They are a complete mystery.”
Response when asked what he thinks about most during the day, "Stephen Hawking at 70: Exclusive interview" http://www.newscientist.com/article/mg21328460.500-stephen-hawking-at-70-exclusive-interview.html in New Scientist (4 January 2012)
Source: A Brief History of Time
"The Quantum State of the Universe", Nuclear Physics (1984) <!-- B239, p. 258 -->
Context: Many people would claim that the boundary conditions are not part of physics but belong to metaphysics or religion. They would claim that nature had complete freedom to start the universe off any way it wanted. That may be so, but it could also have made it evolve in a completely arbitrary and random manner. Yet all the evidence is that it evolves in a regular way according to certain laws. It would therefore seem reasonable to suppose that there are also laws governing the boundary conditions.
Source: A Briefer History of Time
Source: A Brief History of Time (1988), Ch. 8
“God abhors a naked singularity.”
Source: A Brief History of Time
“Disorder increases with time because we measure time in the direction in which disorder increases.”
Source: A Brief History of Time (1988), Ch. 9
Context: Just like a computer, we must remember things in the order in which entropy increases. This makes the second law of thermodynamics almost trivial. Disorder increases with time because we measure time in the direction in which disorder increases. You can’t have a safer bet than that!
“The human capacity for guilt is such that people can always find ways to blame themselves”
Source: The Grand Design
Interview on Israeli television, as quoted in "Happy 65th Birthday to Prof. Stephen Hawking!" at StarTrek.com (8 January 2007) http://www.startrek.com/startrek/view/news/article/37695.html
“Although I cannot move and I have to speak through a computer, in my mind I am free.”
Source: Sigan Ŭn Hangsang Mirae Ro Hŭrŭnŭnʼga: Hokʻing Paksa Ŭi Chaemi Innŭn Chʻoesin Ujuron
“The universe doesn't allow perfection.”
Source: A Brief History of Time