“It may be necessary to use methods other than constitutional ones.”

Source: "Relevance of laboratory experiments to testing resource allocation theory," 1980, p. 346.

The Elegant Universe : Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory (1999), p. 271
Context: Physicists are more like avant-garde composers, willing to bend traditional rules and brush the edge of acceptability in the search for solutions. Mathematicians are more like classical composers, typically working within a much tighter framework, reluctant to go to the next step until all previous ones have been established with due rigor. Each approach has its advantages as well as drawbacks; each provides a unique outlet for creative discovery. Like modern and classical music, it’s not that one approach is right and the other wrong – the methods one chooses to use are largely a matter of taste and training.

From his speech given on 28 November 1960 at laying the foundation-stone of the building of the Law Institute of India, in: p. 14
Presidents of India, 1950-2003

Source: Are We Victims of Propaganda, Our Invisible Masters: A Debate with Edward Bernays (1929), p. 144

That which is seen and that which is not seen (Ce qu'on voit et ce qu'on ne voit pas, 1850), the Introduction.
Context: In the department of economy, an act, a habit, an institution, a law, gives birth not only to an effect, but to a series of effects. Of these effects, the first only is immediate; it manifests itself simultaneously with its cause — it is seen. The others unfold in succession — they are not seen: it is well for us, if they are foreseen. Between a good and a bad economist this constitutes the whole difference: the one takes account only of the visible effect; the other takes account of both the effects which are seen and those which it is necessary to foresee. Now this difference is enormous, for it almost always happens that when the immediate consequence is favourable, the ultimate consequences are fatal, and the converse. Hence it follows that the bad economist pursues a small present good, which will be followed by a great evil to come, while the true economist pursues a great good to come, at the risk of a small present evil.

André-Marie Ampè, in André-Marie Ampère: Enlightenment and Electrodynamics http://books.google.co.in/books?id=QWZKQWB-sbQC&pg=PA159, Cambridge University Press, 1996, p. 159

1980s, GNU Manifesto (1985)

"What is War?" (1924)

Source: Animals Matter: A Biologist Explains Why We Should Treat Animals with Compassion and Respect