Jesus said, “Every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven men. Anyone who speaks a word against the Son of Man, it will be forgiven him; but whoever speaks against the Holy Spirit, it will not be forgiven him, either in this age or in the age to come” (Mathew 12:31-32).
The word, “Therefore” always refers back to what was just said. It is like saying, “For this reason,” or ‘because of this.” The Pharisees just said that Jesus cast out demons by the power of Satan. These men are not accidently connecting the Holy Spirit with Satan. They know what they are doing. Jesus said to the Pharisees, “If you were blind, you would have no sin, but now you say ‘we see’. Therefore your sin remains” (John 9:41). When Jesus raised Lazarus from the dead these men were more worried about losing their political positions than recognizing the visitation of God (John 11:45-48).
The Holy Spirit is the one who convicts us of sin, righteousness and judgment (John 16:8-11). He is the one who teaches us all truth, guides us into all truth, and reminds us of all Jesus has taught (John 14:26; 16:13). To turn against the Holy Spirit is to turn away from God. No one who dies while rejecting God can be saved.
