[Rom 8:27 KJV] 27 And he that searcheth the hearts knoweth what [is] the mind of the Spirit, because he maketh intercession for the saints according to [the will of] God.

[Rom 11:33-34 KJV] 33 O the depth of the riches both of the wisdom and knowledge of God! how unsearchable [are] his judgments, and his ways past finding out! 34 For who hath known the mind of the Lord? or who hath been his counsellor?

[Jhn 4:24 KJV] 24 God [is] a Spirit: and they that worship him must worship [him] in spirit and in truth.

The Spirit that is God has a mind. Therefore, his mind is not a physical tangible thing, but like an energy that cannot be seen.

1Co 3:16 KJV] 16 Know ye not that ye are the temple of God, and [that] the Spirit of God dwelleth in you?...