For what man knows the things of a man except the spirit of the man which is in him? Even so no one knows the things of God except the Spirit of God.
-NKJV-For who knows a person’s thoughts except their own spirit within them? In the same way no one knows the thoughts of God except the Spirit of God.
-NIV-
No one can know a person’s thoughts except that person’s own spirit, and no one can know God’s thoughts except God’s own Spirit.
-NLT-For who knows a person’s thoughts except the spirit of that person, which is in him? So also no one comprehends the thoughts of God except the Spirit of God.
-ESV-