“It terrifies one to think for how short a time science has been methodical and of useful industry; and after all, is there anything on earth more marvelously easy than destruction?”

The Meaning of Education and other Essays and Addresses https://books.google.com/books?id=H9cKAAAAIAAJ (1898) p. 45 as quoted by Robert Édouard Moritz, Memorabilia Mathematica; Or, The Philomath's Quotation-book https://books.google.com/books?id=G0wtAAAAYAAJ (1914)

"Self Portrait" (1968), reprinted in The Shifting Realities of Philip K. Dick (1995), ed. Lawrence Sutin

Source: All Fall Down

Source: Quality Control: Principles, Practice, and Administration. 1951, p. 1

Bearers of the Black Staff

The Vegetarian Way, Proceedings of the 24th World Vegetarian Conference (Madras, India, 1977), p. 34; as quoted in Richard H. Schwartz, Judaism and Vegetarianism (New York: Lantern Books, 2001), p. 75 https://archive.org/stream/JudaismAndVegetarianism#page/n99/mode/2up.

Source: The Montessori Method (1912), Ch. 1 : A Critical Consideration of the New Pedagogy in its Relation to Modern Science, p. 7.
Context: To prepare teachers in the method of the experimental sciences is not an easy matter. When we shall have instructed them in anthropometry and psychometry in the most minute manner possible, we shall have only created machines, whose usefulness will be most doubtful. Indeed, if it is after this fashion that we are to initiate our teachers into experiment, we shall remain forever in the field of theory. The teachers of the old school, prepared according to the principles of metaphysical philosophy, understood the ideas of certain men regarded as authorities, and moved the muscles of speech in talking of them, and the muscles of the eye in reading their theories. Our scientific teachers, instead, are familiar with certain instruments and know how to move the muscles of the hand and arm in order to use these instruments; besides this, they have an intellectual preparation which consists of a series of typical tests, which they have, in a barren and mechanical way, learned how to apply.
The difference is not substantial, for profound differences cannot exist in exterior technique alone, but lie rather within the inner man. Not with all our initiation into scientific experiment have we prepared new masters, for, after all, we have left them standing without the door of real experimental science; we have not admitted them to the noblest and most profound phase of such study, — to that experience which makes real scientists.

The Day After the World Ended, notes for a speech at DeepSouthCon'79, New Orleans (21 July 1979), later published in It's Down the Slippery Cellar Stairs (1995)
Context: Science Fiction has long been babbling about cosmic destructions and the ending of either physical or civilized worlds, but it has all been displaced babble. SF has been carrying on about near-future or far-future destructions and its mind-set will not allow it to realize that the destruction of our world has already happened in the quite recent past, that today is "The Day After The World Ended". … I am speaking literally about a real happening, the end of the world in which we lived till fairly recent years. The destruction or unstructuring of that world, which is still sometimes referred to as "Western Civilization" or "Modern Civilization", happened suddenly, some time in the half century between 1912 and 1962. That world, which was "The World" for a few centuries, is gone. Though it ended quite recently, the amnesia concerning its ending is general. Several historiographers have given the opinion that these amnesias are features common to all "ends of worlds". Nobody now remembers our late world very clearly, and nobody will ever remember it clearly in the natural order of things. It can't be recollected because recollection is one of the things it took with it when it went...