'Spirit of God' in the Bible

For what man is there who knows what a man is, except the man's own spirit within him? So, also, no one comprehends what God is, except the Spirit of God.

The merely intellectual man rejects the teaching of the Spirit of God; for to him it is mere folly; he cannot grasp it, because it is to be understood only by spiritual insight.

Yet she will be happier if she remains as she is-in my opinion, for I think that I also have the Spirit of God.

Therefore I tell you plainly that no one who speaks under the influence of the Spirit of God says 'JESUS IS ACCURSED,' and that no one can say 'JESUS IS LORD,' except under the influence of the Holy Spirit.