I disagree with Paul on this and here is why.

Here is what Paul said.

Hebrews 6:4-6(NKJV)

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.

Now compare that to what Jesus said.

Mark 3:28-30(NKJV)

“Assuredly, I say to you, all sins will be forgiven the sons of men, and whatever blasphemies they may utter; 

but he who blasphemes against the Holy Spirit never has forgiveness, but is subject to eternal condemnation”—

because they said, “He has an unclean spirit.”

Jesus said point blank that there was only one sin that won't be forgiven and that is blaspheming the Holy Spirit.  I don't see anywhere in there where Jesus said no second chances. 

This once again shows why you need to read the Bible with discernment.  Man has this nasty habit of adding their own stuff to God's Scriptures.  It is up to us to tell the difference in my opinion.