Psalm 64:6
They devise injustice and say, “We have perfected a secret plan.” For the inner man and the heart are mysterious.
Berean Standard Bible
They search out iniquities; they accomplish a diligent search: both the inward thought of every one of them, and the heart, is deep.
They plot injustice, saying, “We have made a perfect plan!” Surely man’s mind and heart are cunning.