Is it necessary that God the Holy Spirit have a part
of witnessing for Christ? The answer is found in
1 Corinthians 2:14
But the soulish man (unbeliever) does not accept
the things of the Spirit of God; for they are foolishness
to him. And he is not able to obtain knowledge of the
gospel because they are discerned from the source of
the human spirit (expanded trans).
Blessed be the God and Father of our Lord Jesus Christ.
According to His great mercy, He has caused us to be
born again to a living HOPE through the resurrection
of Jesus Christ.