'Within' in the Bible

For what person knows the thoughts and motives of a man except the man’s spirit within him? So also no one knows the thoughts of God except the Spirit of God.

Do you not know that your body is a temple of the Holy Spirit who is within you, whom you have [received as a gift] from God, and that you are not your own [property]?

To those who are without (outside) the Law, [I became] as one without the Law, though [I am] not without the law of God, but under the law of Christ, so that I might win those who are without law.

For if I pray in a tongue, my spirit prays, but my mind is unproductive [because it does not understand what my spirit is praying].

Then what am I to do? I will pray with the spirit [by the Holy Spirit that is within me] and I will pray with the mind [using words I understand]; I will sing with the spirit [by the Holy Spirit that is within me] and I will sing with the mind [using words I understand].