For it is impossible for those who were once enlightened

Scriptural Citation
Heb 6:4-8
4 For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost, 5 And have tasted the good word of God, and the powers of the world to come, 6 If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame. 7 For the earth which drinketh in the rain that cometh oft upon it, and bringeth forth herbs meet for them by whom it is dressed, receiveth blessing from God: 8 But that which beareth thorns and briers is rejected, and is nigh unto cursing; whose end is to be burned.

Saint Paul, here was talking about those who has witness the manifestation and taste the glory of God, if they should turn away and goes to the way of the world. it would be impossible to renew them again unto repentance seeing they reject the King of Kings.
He explains, that the gifts and blessing can fall on the herbs, thorns and briers alike... but their end is different.
God bless you ALL. @jephline