God’s word and the Holy Spirit are closely related but are not the same thing1,2,3. In one passage1, we can see that the word of God is the Holy Spirit’s sword (consistent with the two-edged sword metaphor). In another passage2, we can see that God’s word is to be guarded by the indwelling of the Holy Spirit. Finally, it’s this same indwelling that “seals” the Christian when they have responded to God’s word in belief.
NOTE: The passage in Paul’s letter to the Corinthians4 is sometimes mistakenly applied to this question. The “we” is not inclusive of all Christians, rather it was applying to Paul and the apostles and references the special promise of the Holy Spirit to the apostles.