Isaiah 40:13 is the exact OT quotation used here—asking who has measured the Spirit of the LORD or shown Him counsel.

Isaiah 40:14 continues the same passage—asking whom God consulted for understanding, underscoring His self-sufficiency.

John 15:15 shows Jesus revealing the Father's will to His friends—paralleling believers now having the mind of Christ.

In John 16:13-16, Jesus promises the Spirit will guide into all truth, explaining how believers have access to the mind of Christ Paul describes.

In John 17:6-8, Jesus says his disciples have received the words from God, paralleling Paul's claim that believers have the mind of Christ.

Romans 11:34 quotes the same Isaiah verse about knowing the Lord's mind, reinforcing that no one can counsel God.

Ephesians 3:3 reveals Paul received the mystery by revelation, directly supporting his claim of having the mind of Christ.

Ephesians 3:4 shows Paul's insight into the mystery, another example of the mind of Christ at work.

Deuteronomy 29:29 distinguishes God's secret things from revealed ones—Paul then claims the secret wisdom is now revealed to believers.

Job 11:7 asks if anyone can find out God's depths, echoing Paul's question about knowing the Lord's mind.

Job 21:22 asks if anyone can teach God knowledge, directly paralleling 'instruct him' in 1 Cor 2:16.

Job 36:23 asks who prescribes God's way, similar to Paul's rhetorical question about instructing the Lord.

In Daniel 4:35, the same question of knowing God's mind appears — Nebuchadnezzar acknowledges God's unsearchable will, which Paul echoes before asserting believers have Christ's mind.

Job 40:2 challenges anyone who contends with God—echoes the idea that no one can instruct the Lord, reinforcing human inability.

Jeremiah 23:18 asks who has stood in God's council to hear His word—a parallel question about knowing the Lord's mind.