One cannot seek the forgiveness from God while at the same time rejecting God. "The unforgivable sin of speaking against the Holy Spirit has been interpreted in various ways, but the true meaning cannot contradict other Scripture. It is unequivocally clear that the one unforgivable sin is permanently rejecting Christ (John 3:18; 3:36). Thus, speaking against the Holy Spirit is equivalent to rejecting Christ with such finality that no future repentance is possible. 'My spirit shall not always strive with man,' God said long ago (Genesis 6:3).
Acts 2:17 describing what is speaking the Holy Spirit comes from Joel 2:28-31 "And it shall come to pass in the last days, saith God, 'I will pour out of My Spirit upon flesh: and your sons and your daughters (gasp) shall prophesy, and your young men shall see visions, and your old men shall dream dreams".........