“In the Bernstein Manual there is a short chapter on undercover work. The first line says, in capital letters, AVOID UNDERCOVER WORK.”

— Eoin Colfer, book Half Moon Investigations

Half Moon Investigations (2006)

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Eoin Colfer185

Irish author of children's books 1965

Lindsey Davis book The Third Nero

The Third Nero
Context: “Their work was undercover—yet their existence unconcealed. That is how fear works.”

“I have after years of thinking on the subject come to the conviction that work is the only instrument of effective education. It may sometimes be manual work, at others, non-manual work.”

Zakir Hussain (politician) (1897–1969) 3rd President of India

In p. 14.
Uniqueness of Zakir Husain and His Contributions (1997)

“I have after years of thinking on the subject come to the conviction that work is the only instrument of effective education. It may sometimes be manual work and sometimes non-manual work. Although it is work alone that can educate, I have also come to the conviction by long observation and experience that all work does not educate.”

Zakir Hussain (politician) (1897–1969) 3rd President of India

Source: Philosophy of Education, p. 88.

“In March 1879 Clifford died at Madeira; six years afterwards a posthumous work is for the first time placed before the public. …The original work as planned by Clifford was to have been entitled The First Principles of the Mathematical Sciences Explained to the Non-Mathematical, and to have contained six chapters, on Number, Space, Quantity, Position, Motion, and Mass respectively. Of the projected work Clifford in the year 1875 dictated the chapters on Number and Space completely, the first portion of the chapter on Quantity, and somewhat later nearly the entire chapter on Motion. The first two chapters were afterwards seen by him in proof, but never finally revised. Shortly before his death he expressed a wish that the book should only be published after very careful revision and that its title should be changed to The Common Sense of the Exact Sciences.”

William Kingdon Clifford (1845–1879) English mathematician and philosopher

Preface by Karl Pearson
The Common Sense of the Exact Sciences (1885)

“To avoid any assertion about the infinitude of the straight line, Euclid says a line segment”

Morris Kline (1908–1992) American mathematician

Source: Mathematical Thought from Ancient to Modern Times (1972), p. 175
Context: To avoid any assertion about the infinitude of the straight line, Euclid says a line segment (he uses the word "line" in this sense) can be extended as far as necessary. Unwillingness to involve the infinitely large is seen also in Euclid's statement of the parallel axiom. Instead of considering two lines that extend to infinity and giving a direct condition or assumption under which parallel lines might exist, his parallel axiom gives a condition under which two lines will meet at some finite point.

“I am afraid that this chapter will amply demonstrate the truth of Clarke's 69th Law, viz., "Reading computer manuals without the hardware is as frustrating as reading sex manuals without the software."”

Arthur C. Clarke (1917–2008) British science fiction writer, science writer, inventor, undersea explorer, and television series host

In both cases the cure is simple though usually very expensive.
"Appendix II: MITE for Morons," The Odyssey File (1984), p. 123
1960s, Clarke's Three Laws, et al (1962; 1973…)