God is a Spirit: and they that worship him must worship him in spirit and in truth (John 4:24).
The Bible teaches that man is a spirit; he has a soul and lives in a body. With his spirit, he relates with the spirit-realm, the realm of his actual existence. With his body, he make contact with the material world, and with his soul, he contacts the intellectual realm.
Many people have never understood the difference between the mind and the spirit; they think the mind is the spirit, but they’re not the same. When you were born again, it wasn’t your body or your mind that was born again; it was your spirit. The Bibles says, “…if any man be in Christ, he is a new creation” (2 Corinthians 5:17) it’s your spirit that’s in Christ; that’s the real you; that’s the man that relates with God.
The Lord Jesus said God is a Spirit, and those who worship Him must worship Him in Spirit and in truth. This simply means worshipping God from the heart according to the Word which is truth. We understand the things of God from our spirit. Romans 10:10 says “…with the heart (i.e spirit) man believeth unto righteousness….”
Then based on that relationship, we condition our minds to go in the same direction, and condition our senses to function likewise. So, you’re to control your mind and your senses from your spirit. That means, the character that you express outwardly depends on the condition of your spirit which is your heart.
That’s why we need the Spirit of God
to guide us because only the Holy Spirit can get deep into the human heart to
effect the changes that God wants in us: changes from one level of glory to
another. The Spirit of God guides our minds to think towards God, think like
God, and to think from God.
Man can’t do that by himself; it takes the Holy Spirit to help us do that because our senses were not designed to relate with God; we serve God from our spirit.