(Matthew 12:22-32) "He who is not with me is against me, and he who does not gather with me scatters. Therefore I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven. And whoever says a word against the Son of man will be forgiven; but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come"
(Hebrews 6):4 For it is impossible for those who were once illuminated, have tasted also the heavenly gift, and were made partakers of the Holy Ghost,  Have moreover tasted the good word of God, and the powers of the world to come,  And are fallen away: to be renewed again to penance, crucifying again to themselves the Son of God, and making him a mockery.  For the earth that drinketh in the rain which cometh often upon it, and bringeth forth herbs meet for them by whom it is tilled, receiveth blessing from God.  But that which bringeth forth thorns and briers, is reprobate, and very near unto a curse, whose end is to be burnt.  But, my dearly beloved, we trust better things of you, and nearer to salvation; though we speak thus.  For God is not unjust, that he should forget your work, and the love which you have shewn in his name, you who have ministered, and do minister to the saints.
(Hebrews 10):25 Not forsaking our assembly, as some are accustomed; but comforting one another, and so much the more as you see the day approaching.  For if we sin willfully after having the knowledge of the truth, there is now left no sacrifice for sins,  But a certain dreadful expectation of judgment, and the rage of a fire which shall consume the adversaries.  A man making void the law of Moses, dieth without any mercy under two or three witnesses:  How much more, do you think he deserveth worse punishments, who hath trodden under foot the Son of God, and hath esteemed the blood of the testament unclean, by which he was sanctified, and hath offered an affront to the Spirit of grace?  For we know him that hath said: Vengeance belongeth to me, and I will repay. And again: The Lord shall judge his people.
Some exegesis help?