“Do not be afraid of the word 'theory'. Yes, it can sound dauntingly abstract at times, and in the hands of some writers can appear to have precious little to do with the actual, visual world around us. Good theory however, is an awesome thing. [...] But unless we actually use it, it borders on the metaphysical and might as well not be used at all.”

“I am using the word theory as a scientist means it: a set of ideas so well established by observations and physical models that it is essentially indistinguishable from fact. That is different from the colloquial use that means "guess." To a scientist, you can bet your life on a theory. Remember, gravity is "just a theory" too.”

“What we can do, we must do: we must use what we are given, and we must use it the best we can, however much or little help we have for the task. What you have been given is a hard thing--a very hard thing... But my darling, what if there were no one who could do the difficult things?”

“I think actually if you take the analogy with other areas of engineering, and increasingly of science and even mathematics, you can see people do not have to learn the vast number of formulae they used to learn. Instead, they have to learn to use the computer effectively. This frees them, I feel, to understand concepts and the foundations while they’re learning the mechanics of the application of the theory.”

“In a life, or a portion of a life illuminated, there's a fullness and a balance that no theory or abstraction can match. Why do people waste so much time on abstraction? The life that is given to us, that we play out, is something that you cannot any more grasp with systems and ideas than you can tame an elephant with tweezers.”

“I wasn’t going anywhere and neither was the rest of the world. We were all just hanging around waiting to die and meanwhile doing little things to fill the space. Some of use weren’t even doing little things. We were vegetables.”