"Some have compared eternity with the sands on the sea shore, drops of water in all the oceans of the world, or the multiple letters in the books that have ever been printed. But in the fanciful flight of our imagination we might still look forward to a time when every grain of sand might be counted, every drop in the oceans or letters in all the books accounted for, and yet, when all that is accomplished we would still be forced to say that eternity had just begun.
This is the eternity that confronts us at death. From the moment you and I were born into the world, each of us was started on the road to eternity. Mark the words of Holy Writ, saying, 'Man shall go into the house of HIS eternity (Eccles. 13, 5). Note the words, 'his eternity! Your eternity, my eternity, because everyone prepares his own eternity. The Creator has endowed us with understanding and free will. The choosing is ours to determine what kind of an eternity awaits us. The difference lies between sinner and saint. In Christ's own words, the former will be greeted with the words: 'Come, ye blessed of my Father, possess you the kingdom prepared for you; the latter with the words: 'Depart from me, ye cursed, into everlasting fire (Matt. 25, 34-41).
[...] But the word 'hell is no longer a welcome word in polite society. Much less will such tolerate any mention of eternal punishments or of everlasting fire and torments in hell. Now, we wish to frighten nobody. But silence will not extinguish the pains of hell, nor render them non-existent. Were all of us to agree to remain silent on the subject, hell would still continue to exist; for as sure as there is a heaven to hope for, so surely is there a hell to fear. Our Lord told us so, and God cannot deceive. And since this is true, we should think of it and speak of it more frequently; for knowing it, we shall fear it, and fearing it, we shall avoid it.
[...] Let us never lose sight of the fact that, by God's eternal decree, heaven is our goal, heaven is man's destiny. Reason, revelation, and the experience of more than six thousand years unite in the one proclamation that perfect happiness cannot be found in this world. It certainly cannot be found in creatures, because they were not endowed with the powers to bestow it. Perfect happiness cannot be found even in the practice of virtue, because God, in His wisdom, has decreed that virtue should merit, but never impart perfect happiness in this world. But God has solemnly pledged to bestow 'eternal life upon all who love and serve Him here on earth. He has promised a happiness so unspeakably great that it will surpass all that our senses ever enjoyed here on earth."
Read in full here: An Eternity of Heaven or Hell