Excerpt adapted from R.C. Sproul’s Mark, the fifth volume in the St. Andrew’s Expositional Commentary series.
“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” (Mark 3:28–29).
I cannot tell you how many times in my teaching career very distraught Christians have come to me to ask about the unpardonable sin and whether they might have committed it. I suspect most believers have asked themselves whether they have done something unforgivable. It is not surprising that many people struggle with this issue because the precise nature of “the unpardonable sin” is difficult to discern and many theories about it have been set forth through church history. For instance, some people have argued that the unpardonable sin is murder and others have said that it is adultery, because they see the serious consequences that those sins wreak on the sanctity of life and the sanctity of marriage. But I can speak with full assurance that neither of those sins is unpardonable. There are two reasons for my assurance. First, Scripture shows us examples of people who committed these sins and were forgiven. Exhibit A is David, who was guilty of both adultery and murder, and yet, after his confession and repentance, he was restored fully to his state of grace. Second, and more important, when Jesus taught on the unpardonable sin, He said nothing about murder or adultery.