“The stone that was rolled before Christ's tomb might appropriately be called the philosopher's stone because its removal gave not only the pharisees but, now for 1800 years, the philosophers so much to think about.”
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Sören Kierkegaard 309
Danish philosopher and theologian, founder of Existentialism 1813–1855Related quotes

“5040. Thrift is the Philosopher's Stone.”
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

“1154. Content is the Philosopher’s Stone, that turns all it touches into Gold.”
Compare Poor Richard's Almanack (1758) : Content is the Philosopher’s Stone, that turns all it touches into Gold.
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

Creation Myths (1972), Creation Renewed & Reversed
Context: In other words, the idea of the philosopher's stone of the alchemists is identical with the idea of the glorified body. This offers an archetypal approach to some Eastern ideas, because in different Eastern yoga practices and meditation the goal is to produce within oneself the so-called diamond body which is an immortal nucleus of the personality.

“If you know how to spend less than you get, you have the philosopher's stone. ”

As quoted in "Eco-designs on future cities" by BBC News (14 June 2005) http://news.bbc.co.uk/2/hi/science/nature/4682011.stm
The quote “The Stone Age did not end for lack of stone, and the Oil Age will end long before the world runs out of oil” appears in The Telegraph, attributed to Sheikh Ahmed Zaki Yamani, and precedes McDonough's reference by 5 years (2000 vs. 2005) Sheikh Yamani predicts price crash as age of oil ends http://www.telegraph.co.uk/news/uknews/1344832/Sheikh-Yamani-predicts-price-crash-as-age-of-oil-ends.html

Source: Cosmic Trigger Volume I: Final Secret of the Illuminati

Letter to James Laughlin (14 January 1944), published in The Selected Letters of William Carlos Williams (1957) edited by John C. Thirlwall, p. 219
General sources

In God and the Folly of Faith: The Incompatibility of Science and Religion (2012)