In Psalm 8 we read where the Psalmist is asking the Lord "What is man that thou art mind full of him, and the son of man that thou visitest him."
The Spirit of God is what a 'man' is. A 'man' is the Spirit of God (the consciousness of God) embodied! (It's what a 'man' is!) We cannot separate the Spirit of God, from the Mind of God, so we can say that a 'man' is also the 'Mind of God' embodied. And the Mind of God, is what has given being to every 'thing' in the Universe! It is the activator of the Creative principle, without which nothing would exist. It sets in motion the creation of every 'thing'. There is nothing besides it nor is there anything other than it. And IT is the "I" within each of us. IT is the "I" that I am! Each of us is the Spirit of God individualized, the consciousness of God embodied. IT is the 'invisible' reality of each of us. IT is the Holy Spirit, the Father. And of course, the person of the Father, is the son. Not only is the Holy Spirit the Father, it is also the son. Every "man" on Earth, is in fact the Holy Spirit embodied but virtually no one realizes this. IT 's what a 'man' (a 'human' being) is! And each of us, is an activator of the Creative Principle! We set it in motion AS WE THINK! It is for this reason that we must die as the person we believe ourselves to be, in order that the Father (the "I" within us) be resurrected. The Spirit of God, is the 'substance' of all form. It is programmable. It can be made to become whatever we believe or whatever we decree as being. To know this, and to function in this consciousness, (in awareness of this) is to be 'filled' with the Holy Spirit!
This is what Jesus was actually telling us in Matthew 10:20, "For it is not ye that speak, but the Spirit of your Father which speaketh in you. We are fearfully and wonderfully made! We are God individualized!