Repentance Impossible by Kendall Fox
Hebrews 6:4-6
4 For it is impossible, in the case of those who have once been enlightened and have tasted of the heavenly gift and have been made partakers of the Holy Spirit,
5 and have tasted the good word of God and the powers of the age to come,
6 and then have fallen away, to restore them again to repentance, since they again crucify to themselves the Son of God and put Him to open shame.