Time is understood and measured through periodicity, the chance of anything to re occur. In contrast, eternity has no beginning and no end. Only God has no beginning or end. In eternity, any single event has a non zero chance to happen. Energy is linked to time by the Heisenberg uncertainty, causing even the most massive black holes to evaporate into nothing. In eternity every energy is zero.
God says through Paul, that to know joy we must learn pain and to know pain we must learn joy, so the souls in heaven can view the souls in hell and vice versa.
To complete the time itself, which was forced into being because creation has a start point, the last of creation, the best angel, Lucifer corrupted, and the last of creation, the best physics, the woman got corrupted.
So as a result, time itself brings suffering.
Furthermore, Romans says that there is an ongoing effort to migrate the creation out of time and into eternity, in the hope of stopping the suffering.
But as above, Heisenberg renders eternity zero energy, and both eternal joy and eternal torment. So until time itself is eliminated, suffering will continue. Does therefore the devil have the last laugh again?
What is the trAditional concept of time and eternity?
You're quite the sad troll.
For St. Thomas, Eternity is just that, there is no beginning and no end, there is no "before" and no "after" but only the present "now". Time began when God created. Beings that are contingent; that depend on another for their existence, have a beginning and there is a succession of events, a "before", a "now" and an "after". But spiritual beings, since their are simple, that is, not composed of parts, will not cease to be, but they still live in time; as it were in a succession of moments. When this life passes and the world is changed after the last judgement, the souls of the just will live in eternal happiness in the presence of God in Heaven, in what theologians call "aeveternity"
Here is the Wiki article describing Aeveternity:
QuoteIn Scholastic philosophy, the aevum (also called aeviternity) is the mode of existence experienced by angels and by the saints in heaven. In some ways, it is a state that logically lies between the eternity (timelessness) of God and the temporal experience of material beings. It is sometimes referred to as "improper eternity".[1] The word aevum is Latin, originally signifying "age", "aeon", or "everlasting time";[2] the word aeviternity comes from the Medieval Latin neologism aeviternitas.
The concept of the aevum dates back at least to Albertus Magnus's treatise De quattuor coaequaevis.[3] Its most familiar description is found in the Summa theologica of Thomas Aquinas. Aquinas identifies the aevum as the measure of the existence of beings that "recede less from permanence of being, forasmuch as their being neither consists in change, nor is the subject of change; nevertheless they have change annexed to them either actually, or potentially". As examples, he cites the heavenly bodies (which, in medieval science, were considered changeless in their nature, though variable in their position) and the angels, which "have an unchangeable being as regards their nature with changeableness as regards choice".[4]
Frank Sheed, in his book Theology and Sanity, said that the aevum is also the measure of existence for the saints in heaven: "Aeviternity is the proper sphere of every created spirit, and therefore of the human soul... At death, [the body's] distracting relation to matter's time ceases to affect the soul, so that it can experience its proper aeviternity."[5]
You can read St. Thomas in the Summa here: http://www.newadvent.org/summa/1010.htm; where he treats of the eternity of God.