Romans 11:33
O, how deep is the richness of God's wisdom and knowledge! How difficult [it is for us] to explain His judgments and how impossible [for us] to accurately track how He operates!
Matthew 11:27
"All things have been entrusted to me by my Father and no one [truly] knows the Son except the Father. And neither does anyone [truly] know the Father except the Son and that person to whom the Son wants to reveal Him.
1 Corinthians 2:10
But God has revealed [to us] these things [i.e., His divine wisdom. See verses 7-8] through the Holy Spirit. For the Holy Spirit searches everything, even the deep things of God.
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].
Ephesians 3:8
This favor of preaching the unfathomable riches of Christ to the Gentiles was given to me [even though] I am the least significant of all saints [i.e., God's holy people].