“The essence of science is that it is always willing to abandon a given idea for a better one; the essence of theology is that it holds its truths to be eternal and immutable.”
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H.L. Mencken 281
American journalist and writer 1880–1956Related quotes

“The essence of life is change, he said, and the essence of eternal life is eternal change.”
Source: Darwinia (1998), Chapter 25 (p. 209)

Source: The Martyrdom of Man (1872), Chapter I, "War", p. 27.

“The essence of things is eternal”
The Life of Pythagoras (1919)
Context: Fragment 4. This is the state of affairs about nature and harmony. The essence of things is eternal; it is a unique and divine nature, the knowledge of which does not belong to man. Still it would not not be possible that any of the things that are, and are known by us, should arrive to our knowledge, if this essence was not the internal foundation of the principles of which the world was founded, that is, of the finite and infinite elements. Now since these principles are not mutually similar, neither of similar nature, it would be impossible that the order of the world should have been formed by them, unless the harmony had intervened... the dissimilar things, which have neither a similar nature, nor an equivalent function, must be organized by the harmony, if they are to take their place in the connected totality of the world.

Materialism and Empirio-Criticism (1908)

“We abandoned the appearance of power to preserve the essence of it.”
Source: The Foundation series (1951–1993), Foundation’s Edge (1982), Chapter 20 “Conclusion” section 1, p. 408

as quoted by Tehmina Durrani author of A Mirror to the Blind, a biography of Abdul Sattar Edhi at Balzan Prize ceremony ( November 17, 2000, http://www.balzan.org/en/prizewinners/abdul-sattar-edhi/abdul-sattar-edhi-in-milan-speech-pronounced-by-tehmina-durrani/), retrieved July 21, 2016

Assorted Themes, On Eternal Bestowal and Transient Reception