In one sense, there are only two eternal destinations: Heaven and Hell, no third option. (Mt 25:46) So the chosen strive to enter Heaven (Lk 13:24), seeking the Lord for eternal salvation until they have it. (He 11:6) We can’t afford to get this wrong. (Mt 16:26)
But this dual nature of eternity can be misleading; in only two possible general outcomes, we might fail to see the many possibilities within each one: there’s surely joy in every heavenly place (Jud 24), and sorrow throughout Hell, but some heavenly states are much more desirable than others (Mt 5:19), and some hellish places far worse than others. (Mt 11:24)
Scripture is clear that we’ll all be recompensed based on our behavior; those who’ve done good will be resurrected to life, and those who’ve done evil will be raised unto damnation. (Jn 5:28-29) It isn’t that we can earn salvation by being good, but those who know God love Him (1Pe 2:7), and do their best to please Him. All the saints will receive a reward (2Ti 4:8), yet some of us serve God better than others, and will get a better reward for our labor; it makes a difference how we live.
Christ will repay each and every one of us according to our works (Mt 16:27); so, as there are degrees of good and evil, there will also be degrees of rewards (Mt 5:19) and punishments. (Lk 12:47-48a)
To the degree that our works are deficient, corrupt, tainted with wrong motives, even as believers in Heaven we suffer loss. (1Co 3:13-15) And if we’re actually despising the truth, headed for Hell (Ro 2:8), we’d be much better off if we’d never known the truth at all. (2Pe 2:21)
The boundaries of both Heaven and Hell lie in the infinitude of God Himself. His fury can address the deepest depravity, of Satan himself, and His delight the purest heart, that of Christ Himself. He is capable of giving the saints more than the very best of us can possibly fathom or enjoy (1Co 2:9), and is able to crush His enemies (Lk 20:18) with a fierceness and indignation that even the most rebellious heart cannot endure. (Na 1:6)
Though we aren’t saved by works (Ep 2:8-9), how we live each day does make an eternal difference (Mt 10:42); whatever we sow we reap (Ga 6:7); the more we sow the more we reap, whether for good or evil. Every single choice is thus an eternal one.
Run for a reward in God (1Co 9:26); He calls us to run that we may obtain (1Co 9:24), so run with all your might — for this reward is God Himself. (Ge 15:1, Php 3:8)