Romans 11:34
[Note: The following are rhetorical questions raised from their reading of the Old Testament]. For who has known [what goes on in] the Lord's mind? Or, who has been His advisor?
Matthew 11:25
About that time Jesus said [in prayer], "I thank you, O Father, Lord of heaven and earth, that you have hidden these things [i.e., the significance of Jesus' words and works] from those who [thought they] were wise and intelligent and have [instead] revealed them to people who are child-like.
Matthew 13:11
He replied, "You disciples are being given an understanding of the secrets of the kingdom of heaven, but the crowds of people are not.
Matthew 13:35
[This was] so that what was spoken by the prophet would be fulfilled, when he said [Psa. 78:2], "I will open my mouth [to speak] with parables. I will say things that have been hidden from the beginning of time."
John 15:15
I do not call you slaves anymore, for a slave does not know what his master is doing. But I have called you friends, because I have told you everything that I heard from my Father.
Romans 16:25-26
Now may there be glory for ever, through Jesus Christ, to the only wise God, who is able to make you stand firm [in the faith], according to the good news and proclamation of Jesus Christ. This message is the secret which was [eventually] revealed, after having been kept quiet about for long ages.
1 Corinthians 2:9-11
But as it is written [Isa. 64:4], "The things which no eye saw or ear heard, and which did not [even] enter the mind of men, is what God has prepared for those who love Him."
1 Corinthians 2:16
[Isa. 40:13 says], "For who knows [what is in] the Lord's mind? And who is capable of instructing Him? But we have the mind of Christ. [Note: The "we" may refer to the apostles, who had the gift of inspiration (See verse 12), or to all Christians who have spiritual discernment].