1 Corinthians 2:16

Isaiah 40:13-14 NIV
Who can fathom the Spirit of the Lord, or instruct the Lord as his counselor? Whom did the Lord consult to enlighten him, and who taught him the right way? Who was it that taught him knowledge, or showed him the path of understanding?

John 15:15 NIV
I no longer call you servants, because a servant does not know his master’s business. Instead, I have called you friends, for everything that I learned from my Father I have made known to you.

John 16:13-16 NIV
But when he, the Spirit of truth, comes, he will guide you into all the truth. He will not speak on his own; he will speak only what he hears, and he will tell you what is yet to come. He will glorify me because it is from me that he will receive what he will make known to you. All that belongs to the Father is mine. That is why I said the Spirit will receive from me what he will make known to you.” Jesus went on to say, “In a little while you will see me no more, and then after a little while you will see me.”

Romans 11:34 NIV
“Who has known the mind of the Lord? Or who has been his counselor?”