“Opus Dei is an efficient machine run to achieve world power.”

Quoted and attributed to Graham in Warren Buffett's 1993 letter to investors. https://www.berkshirehathaway.com/letters/1993.html
The statement is not found in any of Graham's publications or lecture transcripts, and when asked, Buffett could not provide a reference. https://www.bogleheads.org/forum/viewtopic.php?t=77840
Disputed

Karl Popper, The Open Society and its Enemies, Vol I Plato Chapter 5: Nature and Convention. P. 67
The Open Society and Its Enemies (1945)
Context: In speaking of sociological laws or natural laws of social life I have in mind such laws as are formulated by modern economic theories, for instance, the theory of international trade, or the theory of the trade cycle. These and other important sociological laws are connected with the functioning of social institutions. These laws play a role in our social life corresponding to the role played in mechanical engineering by, say, the principle of the lever. For institutions, like levers, are needed if we want to achieve anything which goes beyond the power of our muscles. Like machines, institutions multiply our power for good or evil. Like machines, they need intelligent supervision by someone who understands their way of functioning and, most of all, their purpose, since we cannot build them so that they work entirely automatically.

Words of Wisdom (2010)

Basil Cardinal Hume, From a homily on October 2, 1998, at a Mass of thanksgiving in London to mark the 70th anniversary of the founding of Opus Dei.

Yukihiro Matsumoto " The Philosophy of Ruby, A Conversation with Yukihiro Matsumoto, Part I http://www.artima.com/intv/ruby4.html" by Bill Venners on 2003-09-29 (Artima Developer).

Economics in One Lesson (1946), The Curse of Machinery (ch. 7)

Disputed

2010s, 2017, February