A friend wrote me recently requesting prayer for his recurring fears of having committed the unpardonable sin mentioned in Matthew 12:31 - "Therefore I say to you, any sin and blasphemy shall be forgiven people, but blasphemy against the Spirit shall not be forgiven."
Here is my response, in which I took a slightly different angle to the issue:
I'd be happy to pray that the Lord would send you His comforting peace, the "peace that surpasses all understanding".
I hope you'll permit me to share a few things from the Word of God with you on this topic. My very favorite verse in the Bible is Romans 8:28, and Romans 8 is my very favorite chapter! "God works all things out for the good of those who love Him and who are called according to His purpose." He has called you out for His purposes, many of which are unseen but are (because they are unseen) more permanent than the things which are seen (2 Corinthians 4:18).
Now, follow along to the very next verses, v 29-30.
For those whom He foreknew, He also predestined to become conformed to the image of His Son, so that He would be the firstborn among many brethren; 30 and these whom He predestined, He also called; and these whom He called, He also justified; and these whom He justified, He also glorified.
He has foreknown who you are and who you will be and your deliverance in Christ. And look how He takes the whole thing to completion - those who are justified are also glorified. It doesn't say that "most of those whom He justified He also glorified" or "some of those whom He justified". It's "those whom He justified".
Take a look at John 6:
37 - "All that the Father gives Me will come to Me, and the one who comes to Me I will certainly not cast out."
27 "My sheep hear My voice, and I know them, and they follow Me; 28 and I give eternal life to them, and they will never perish; and no one will snatch them out of My hand."
Notice that - they will never perish. But what about those who commit the blasphemy against the Holy Spirit? Well, they'll perish, but those who are His sheep will never perish. Thus, none of Christ's sheep will ever commit that blasphemy. You might as well say that they are incapable of doing so, incapable of breaking God's powerful protection over their lives in such a way.
1 Peter says just that:
1 Peter 1: 3 - In his great mercy he has given us new birth into a living hope through the resurrection of Jesus Christ from the dead, 4and into an inheritance that can never perish, spoil or fade—kept in heaven for you, 5who through faith are shielded by God’s power until the coming of the salvation that is ready to be revealed in the last time.
He is protecting you. It's not up to you, and it never was. Do you have faith in Christ and Him alone to save you? Trust Him to bring you thru! If you do not, take this moment, right now, to tell Him, as Psalm 119:94 says, "I am Yours, save me."
Can we know that He is our Lord? Certainly we can.
1 John 5:13 - I write these things to you who believe in the name of the Son of God so that you may know that you have eternal life.
You may KNOW it. Do you believe in the name of the Son of God?
Galatians 4:6 - Because you are sons, God has sent forth the Spirit of His Son into our hearts, crying, "Abba! Father!" 7 Therefore you are no longer a slave, but a son; and if a son, then an heir through God.
More Romans 8:15 - For you have not received a spirit of slavery leading to fear again, but you have received a spirit of adoption as sons by which we cry out, “Abba! Father!” 16 The Spirit Himself testifies with our spirit that we are children of God...
Do you call God your Father, your Daddy (that's what "Abba" means)? Notice that, while there is a subjective element to all this, yet also it is a fact that the Spirit testifies to our adoption by God.
Finally, note 1 Corinthians 12:3 - Therefore I make known to you that no one speaking by the Spirit of God says, "Jesus is accursed"; and no one can say, "Jesus is Lord," except by the Holy Spirit.
Do you say "Jesus is Lord" and mean it? This is not possible for the lost, unredeemed man. Take heart in that, my friend. Salvation is God's work and arena, not yours. And thank God for that - the stuff we do is why we need forgiveness, salvation, and redemption in the first place! God is our rescuer.
Here's a useful article to start thinking about this sin biblically.
I'll be praying for you. May the Lord bless you with His peace.