“In the end, nothing is lost. Every event, for good or evil, has effects forever.”
Source: The Story of Civilization
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Will Durant 85
American historian, philosopher and writer 1885–1981Related quotes

“Nothing is lost. Nothing is forgotten.
It was in the blood, the flesh,
And now it is forever.”
Interphase: Thought Universe (p. 247; closing lines)
Blood Music (1985)

Very often attributed to Addison, this is in fact by Hugh Blair, published in Blair's Sermons (1815), Vol. 1, pp. 196-197.
Misattributed

“Welt muss mehr denn je diese Botschaft hören,” Giessener Allgemeine Zeitung, Giessen, Germany, April 12, 2005.
Attributed

Source: My Several Worlds (1954), p. 52 - 53
Context: Every event has had its cause, and nothing, not the least wind that blows, is accident or causeless. To understand what happens now one must find the cause, which may be very long ago in its beginning, but is surely there, and therefore a knowledge of history as detailed as possible is essential if we are to comprehend the present and be prepared for the future. Fate, Mr. Kung taught me, is not the blind superstition or helplessness that waits stupidly for what may happen. Fate is unalterable only in the sense that given a cause, a certain result must follow, but no cause is inevitable in itself, and man can shape his world if he does not resign himself to ignorance.