Common sense … has the very curious property of being more correct retrospectively than prospectively. It seems to me that one of the principal criteria to be applied to successful science is that its results are almost always obvious retrospectively; unfortunately, they seldom are prospectively. Common sense provides a kind of ultimate validation after science has completed its work; it seldom anticipates what science is going to discover.

The most valuable and least replacable resource is time.

Common sense … has the very curious property of being more correct retrospectively than prospectively. It seems to me that one of the principal criteria to be applied to successful science is that its results are almost always obvious retrospectively; unfortunately, they seldom are prospectively. Common sense provides a kind of ultimate validation after science has completed its work; it seldom anticipates what science is going to discover.

Creativity is the ability to identify self-imposed constraints, remove them, and explore the consequences of their removal.

Nothing is harder to topple than a fact that supports a deeply held prejudice denied by its holder.

Every problem interacts with other problems and is therefore part of a set of interrelated problems, a system of problems. I choose to call such a system a mess.

Most corporate mission statements are worthless. They consist largely of pious platitudes such as: "We will hold ourselves to the highest standards of professionalism and ethical behavior." They often formulate necessities as objectives; for example, "to achieve sufficient profit." This is like a person saying his mission is to breathe sufficiently.