“Eternity is said not to be an extension of time but an absence of time.”
Source: The End of the Affair
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Graham Greene 164
English writer, playwright and literary critic 1904–1991Related quotes

Appeal to Youth: Intoxication-Disintoxication (1934).
“Hell […] is the absence of God and the presence of Time.”
Source: I, Lucifer

Hofnung un Shrek, 1906. Alle Verk, xiii. 9.

“Time is eternity and eternity is time, just as long as you yourself don't make them different”
The Cherubinic Wanderer

Episode 2, Chapter 13-14
The Power of Myth (1988)
Context: Campbell: Eternity isn't some later time. Eternity isn't a long time. Eternity has nothing to do with time. Eternity is that dimension of here and now which thinking and time cuts out. This is it. And if you don't get it here, you won't get it anywhere. And the experience of eternity right here and now is the function of life. There's a wonderful formula that the Buddhists have for the Bodhisattva, the one whose being (sattva) is illumination (bodhi), who realizes his identity with eternity and at the same time his participation in time. And the attitude is not to withdraw from the world when you realize how horrible it is, but to realize that this horror is simply the foreground of a wonder and to come back and participate in it. "All life is sorrowful" is the first Buddhist saying, and it is. It wouldn't be life if there were not temporality involved which is sorrow. Loss, loss, loss.
Moyers: That's a pessimistic note.
Campbell: Well, you have to say yes to it, you have to say it's great this way. It's the way God intended it.

Book the First, 24:72
1800s, Milton (c. 1809)

“Time is the image of eternity.”
Plato, 41.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 3: Plato

Incorrectly attributed to Twain, this is actually a quotation from an article in The Pocono Record (18 February 1971, page 4 http://www.newspapers.com/newspage/40447792/)
Misattributed