"For it is impossible, in the case of those who have once been enlightened, who have tasted the heavenly gift, and have shared in the Holy Spirit, and have tasted the goodness of the word of God and the powers of the age to come, and then have fallen away, to restore them again to repentance, since they are crucifying once again the Son of God to their own harm and holding him up to contempt." -- Hebrews 6: 4-6, ESV.
How does the Church handle these verses? Are the verses saying that anyone who falls away cannot repent no matter how hard the person tries, or does "impossible" mean that it is very difficult. For example, I might say that it is impossible to climb Mt. Everest, although some have done so.