New International Version
They plot injustice and say, "We have devised a perfect plan!" Surely the human mind and heart are cunning.

American Standard Version
They search out iniquities; We have accomplished,'say they , a diligent search: And the inward thought and the heart of every one is deep.

Berean Study Bible
They devise injustice and say, “We have perfected a secret plan.” For the inner man and the heart are mysterious.

Douay-Rheims Bible
They have searched after iniquities: they have failed in their search. Man shall come to a deep heart:

English Revised Version
They search out iniquities; We have accomplished, say they, a diligent search: and the inward thought of every one, and the heart, is deep.

King James Bible
They search out iniquities; they accomplish a diligent search: both the inward thought of every one of them, and the heart, is deep.

World English Bible
They plot injustice, saying, "We have made a perfect plan!" Surely man's mind and heart are cunning.

Young's Literal Translation
They search out perverse things, 'We perfected a searching search,' And the inward part of man, and the heart are deep.

Psalm 64:6 Additional Translations ...