"For it is impossible for those who were once enlightened, and have tasted the heavenly gift, and have become partakers of the Holy Spirit, and have tasted the good word of God and the powers of the age to come, if they fall away, to renew them again to repentance, since they crucify again for themselves the Son of God, and put Him to an open shame." (Heb. 6:4-6)

There is an old, familiar nursery rhyme which says, "Humpty Dumpty sat on a wall, Humpty Dumpty had a great fall. All the king's horses and all the king's men couldn't put Humpty Dumpty together again." Actually, this nursery rhyme was first presented in the form of a riddle. It asked, "What, when broken, can never be repaired, not even by all the strongest and wisest individuals?" The answer is: "An egg." Regardless of how hard men try, a broken egg can never be put back together again.

Likewise, under the conditions mentioned in Heb. 6:4-6, it is impossible to bring those individuals to repentance for they are in no condition to repent. When, and only when, they stop crucifying Christ, putting Him to an open shame, etc., they can be brought back.