“But he that is joined unto the Lord is one spirit.”
1 Corinthians‬ ‭6‬:‭17

What a reality shown us in the main verse, he says that we are joined to the Lord and we are one spirit with him- perfectly identified with him just like he desired:
“At that day ye shall know that I am in my Father, and ye in me, and I in you.” John‬ ‭14‬:‭20‬
“I in them, and thou in me, that they may be made perfect in one; and that the world may know that thou hast sent me, and hast loved them, as thou hast loved me.” John‬ ‭17‬:‭23‬
Contemplate on the fact that you are one Spirit with the Lord, there aren’t two spirits inside your body, but the Holy Ghost is perfectly joined and identified with you. What revelation!

Bible Reading Plan: Exodus 5 and Hebrews 13