Hebrews 6:4-6 For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, Now we won’t take time to prove it but this word enlightened means to have complete understanding; tasted of the heavenly gift, taste is the same the Greek word that Jesus tasted (experienced) death for every man and were made partakers of the Holy Ghost. Partakers (to take a portion or take some) is the same Greek word where it says Jesus partook of flesh and blood.
So when he says partakers of the Holy Ghost, he is not talking about someone getting under conviction, is he? He says it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost, (Verse 5) and have tasted the good word of God, and the powers of the world to come. That sure sounds like a saved man to me. Doesn’t it you? We cannot imagine that he wasn’t saved. It is impossible (Verse 6) If they fall away, Do you remember us talking about falling away? to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
Let’s put it this way. God brings a contract to you and says, “Look, Christ died for your sins. He paid for all of them. This is eternal salvation.” And you sign on the contract and God signs under it. You are now saved based on his finished work; absolutely sealed up and saved. All right? After a period of time you sin or leave the faith or whatever you do and it results in you getting back into an unregenerate state, which many people believe happens. OK? Now you are back in an unregenerate state. What has happened? You have out-sinned the contract. That means that you terminated the legal effect of that blood that was shed and that ministry of Christ. Right? It is no longer effective for you. Now, let’s say you want to get saved again so you come back to Christ and say, “OK, I want to get saved again.” Jesus would say, “You have already tried it under this contract and it didn’t work. I would have to die and pay the price again and I am not going to do it. I paid it once. It kept you saved for several years but you lost it; and you can’t get saved under the same contract again. It is impossible to renew you again unto repentance, seeing you crucified to yourself the Son of God afresh and put him to an open shame. You can only get saved one time under the finished work of Christ.”
I have said to people, “Are you saved?” They would say, “Yes, I used to be but I lost it.” I would say to them, “You did? Well, I’m sorry. I was about to talk to you about Jesus but there is nothing I can do for you.” He would say, “Wait a minute! Why?” I would say, “Because you can’t be saved. You are lost forever. You can never be saved.” The man would say, “Wait a minute, wait a minute!” I would say, “No, I’m wasting my time. You might as well go on and live in the world and love it because you are on the way to hell; nothing I can do for you. You are hopeless.” He would yell, “What do you mean I’m hopeless?” Then I would show them that verse of scripture: it is impossible if you should fall away to renew you again unto repentance. I would say, “You can’t repent again. You are too far gone.” I have never had it fail for them to say to me, “Wait a minute! Maybe I wasn’t saved.” Or “Maybe I’m still saved and need to get right with God.” Whatever, it creates a lot of excitement in that individual to want to get right with God right now because the idea of not ever being able to get it back is really scary, and so he doesn’t want to be in that category.
Folks I have pulled that a lot of times and I have never seen it fail to create a lot of excitement in the person I was talking to. In other words, we have a tool, the word of God. And we can use this verse, where a Baptist would never pull this verse out. An ordinary Baptist would never quote that verse. Some Pentecostals have said to me “Wait a minute, you can lose it. Look here.” And he shows me this verse. Impossible to renew them again unto repentance. I would say, “I see what you mean. How long have you been saved?” He would say, “Nineteen years.” I would ask, “Have you ever lost it?” He might say, “Well, I only lost it one time about six months after I got saved.” I would ask, “How long were you lost?” (It’s really funny how they try to tell you how long they were lost.) “Oh, I was lost for 2 weeks.” Then I would answer, “Well, according to this verse right here, you couldn’t repent again if you were lost for 2 weeks. You are lost forever.”
— Taken from Security of the Believer by Michael Pearl