Eternity. What does it mean, and why should one even embrace the concept, particularly with regard to human destiny? We know from personal experience and simple observation that material things wear out. The second law of thermodynamics tells us that the entire universe is wearing out, running down like a wind-up toy, and will not last indefinitely. Obviously then, it must have had a beginning, exactly as the Bible declares.
We know that the sun has not been in the sky forever or it would have burned out by now. The same is true of every other sun. Very clearly, there was a time when this universe did not exist; nothing existed, not even the energy out of which the universe seems to be made.