English Standard Version
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.New International Version
The Spirit searches all things, even the deep things of God. For who among men knows the thoughts of a man except the man's spirit within him? In the same way no one knows the thoughts of God except the Spirit of God.Catholic Public Domain Version
And who can know the things that are of a man, except the spirit which is within that man? So also, no one knows the things which are of God, except the Spirit of God