The word “spirit” is tied to “breath.” The Old Testament Hebrew word ruach is translated breath, wind or spirit. The New Testament Greek pneuma also means wind or spirit. The Holy Spirit is God’s breath in me.
It’s been that way from the beginning:
Genesis 2:7 (NIV)
Then the Lord God formed a man from the dust of the ground and breathed into his nostrils the breath of life, and the man became a living being.
No Spirit, no breath, no life.