“All lasting change is preceded by changed thinking. Any other type of change will only be temporary.”

Source: Parable of the Sower (1993), Chapter 1 (p. 3)

Source: The Causes of Evolution (1932), Ch. IV Natural Selection, p. 102.

Source: Rework

2007 edition, p. 29.
Empire and Communications (1950)
Context: The significance of a basic medium to its civilization is difficult to appraise since the means of appraisal are influenced by the media, and indeed the fact of appraisal appears to be peculiar to certain types of media. A change in the type of medium implies a change in the type of appraisal and hence makes it difficult for one civilization to understand another.

Source: Dimension of Miracles (1968), Chapter 4 (p. 34)

General sources
Source: "My Own View" in The Encyclopedia of Science Fiction (1978) edited by Robert Holdstock;
Context: It is change, continuing change, inevitable change, that is the dominant factor in society today. No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be... This, in turn, means that our statesmen, our businessmen, our everyman must take on a science fictional way of thinking.

As quoted in Office Yoga : Simple Stretches for Busy People (2000) by Darrin Zeer, p. 52