“Time is the image of eternity.”
Plato, 41.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 3: Plato
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Diogenes Laërtius 107
biographer of ancient Greek philosophers 180–240Related quotes

Source: 1910s, Mysticism and Logic and Other Essays http://archive.org/stream/mysticism00russuoft/mysticism00russuoft_djvu.txt (1918), Ch. 1: Mysticism and Logic

“One is then apart from the moving image; one exists in the completion of eternity.”
"New Maps of Hyperspace" (1989); originally published in Magical Blend magazine, also in The Archaic Revival: Speculations on Psychedelic Mushrooms, the Amazon, Virtual Reality, UFOs, Evolution, Shamanism, the Rebirth of the Goddess, and the End of History (1992)]
Context: The alternative physics is a physics of light. Light is composed of photons, which have no antiparticle. This means that there is no dualism in the world of light. The conventions of relativity say that time slows down as one approaches the speed of light, but if one tries to imagine the point of view of a thing made of light, one must realize that what is never mentioned is that if one moves at the speed of light there is no time whatsoever. There is an experience of time zero. … The only experience of time that one can have is of a subjective time that is created by one's own mental processes, but in relationship to the Newtonian universe there is no time whatsoever. One exists in eternity, one has become eternal, the universe is aging at a staggering rate all around one in this situation, but that is perceived as a fact of this universe — the way we perceive Newtonian physics as a fact of this universe. One has transited into the eternal mode. One is then apart from the moving image; one exists in the completion of eternity.

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

Book III, Ch. 1 as quoted in "Astrology in Kepler's Cosmology" by Judith V. Field, in Astrology, Science, and Society: Historical Essays (1987) edited by P. Curry, p. 154
Geometry, coeternal with God and shining in the divine Mind, gave God the pattern... by which he laid out the world so that it might be best and most beautiful and finally most like the Creator.
As quoted in Kepler's Geometrical Cosmology (1988), p. 123
Geometry is one and eternal shining in the mind of God. That share in it accorded to men is one of the reasons that Man is the image of God.
Unsourced variant
Harmonices Mundi (1618)

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.

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