falling away

Hebrews 6.

4 For in the case of those who have once been (10) enlightened and have tasted of (11) the heavenly gift and have been made (12) partakers of the Holy Spirit,
5 and (13) have tasted the good (14) word of God and the powers of (15) the age to come,
6 and then have fallen away, it is (16) impossible to renew them again to repentance, (17) since they again crucify to themselves the Son of God and put Him to open shame.
7 For ground that drinks the rain which often falls on it and brings forth vegetation useful to those (18) for whose sake it is also tilled, receives a blessing from God;
8 but if it yields thorns and thistles, it is worthless and (19) close to being cursed, and it ends up being burned.

9 But, (20) beloved, we are convinced of better things concerning you, and things that accompany salvation, though we are speaking in this way.
10 For (21) God is not unjust so as to forget (22) your work and the love which you have shown toward His name, in having (23) ministered and in still ministering to the saints.
11 And we desire that each one of you show the same diligence so as to realize the (24) full assurance of (25) hope until the end,
12 so that you will not be sluggish, but (26) imitators of those who through (27) faith and patience (28) inherit the promises.