Revelation 15:3

And they were singing the song of Moses, the servant of God, and the song of the Lamb. [The words were], "Your deeds are great and marvelous, O Lord, God Almighty; your ways are just and true, O King of the nations [or, "ages"].

Romans 11:33-34

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!

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.

Treasury of Scripture Knowledge

Summary

O LORD, how great are thy works! and thy thoughts are very deep.

Bible References

O lord

Revelation 15:3
And they were singing the song of Moses, the servant of God, and the song of the Lamb. [The words were], "Your deeds are great and marvelous, O Lord, God Almighty; your ways are just and true, O King of the nations [or, "ages"].

Deep

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.