God speaks through His people.  God is not dependent on raw human reasoning (the reasoning of the human mind without the Intelligence of the Creator flowing through the human mind) to figure out Scripture and speak His Word. (some caveats about hearing God's Voice)

1 Corinthians 12:2-3 Ye know that ye were Gentiles, carried away to these dumb [incapable of articulate speech] idols, even as ye were led.  Wherefore I give you to understand, that no man speaking by the Spirit of God calleth Jesus accursed: and that no man can say that Jesus is the Lord, but by the Holy Ghost.

No person can say that another Christian is accursed by the Spirit of God, either, because of the Christ in that Christian.  They would be calling Jesus accursed.  A brother or sister may be in error or in sin or in confusion, but they are not accursed.

If a the attention and glory is going to a person, that is not by the Spirit of God.  Some denominations give so much glory to a saint who has passed to the other side of glory that the honor of that saint may be in competition with the glory given to the living Christ.  At the same time, can watch people singing that they are giving all the glory to Jesus or loudly proclaiming that they are giving all glory to God and yet their whole production and show gives them the glory.  They are themselves the center of all attention.  This is not by the Spirit of God.  Even the Holy Spirit never speaks of Himself.

When God speaks, He doesn't always use words: "And he said, Hear now my words: If there be a prophet among you, I the LORD will make myself known to him in a vision, and will speak to him in a dream. My servant Moses is not so, who is faithful in all mine house.  With him will I speak mouth to mouth, even apparently, and not in dark speeches; and the similitude of the LORD shall he behold: wherefore then were ye not afraid to speak against my servant Moses?"  Numbers 12:6-8