" Are you perhaps one of those who worries about having committed the unpardonable sin? If so, you should face squarely what the Bible says on this subject, not what you may have heard from others. The unpardonable sin is rejecting the truth about Christ. It is rejecting, completely and finally, the witness of the Holy Spirit, which declares that Jesus Christ is the Son of God who alone can save us from our sins. Have you rejected Christ in your own life, and said in your heart that what the Bible teaches about Him is a lie? Then I tell you as solemnly and as sincerely as I know how that you are in a very dangerous position. I urge you without delay to accept the truth about Christ, and to come to humble confession and repentance and faith. It would be tragic for you to persist in your unbelief, and eventually go into eternity without hope and without God. "
― Billy Graham , The Holy Spirit: Activating God's Power in Your Life