The "unforgivable sin" is mentioned in several passages in the New Testament, including Mark 3:29 and Matthew 12:31-32. According to these passages, blasphemy against the Holy Spirit is the one sin that will not be forgiven by God. Blasphemy against the Holy Spirit is interpreted by Christian theologians in various ways, although they generally agree that one who has committed the sin is no longer able to repent, and so one who is fearful that one has committed it has not done so. The sin is essentially a persistent refusal to acknowledge the presence of God in Christ. The context of the passages suggests that the unpardonable sin was attributing to Satan Christ’s authenticating miracles done in the power of the Holy Spirit and never repenting of that attitude. It is important to note that the unpardonable sin is not some particularly grievous sin committed by a Christian before or after accepting Christ, nor is it thinking or saying something terrible about the Holy Spirit.