2 Samuel 14:18-20

(18) Then the king answered and said unto the woman, Hide not from me, I pray thee, the thing that I shall ask thee. And the woman said, Let my lord the king now speak. (19) And the king said, Is not the hand of Joab with thee in all this? And the woman answered and said, As thy soul liveth, my lord the king, none can turn to the right hand or to the left from ought that my lord the king hath spoken: for thy servant Joab, he bade me, and he put all these words in the mouth of thine handmaid: (20) To fetch about this form of speech hath thy servant Joab done this thing: and my lord is wise, according to the wisdom of an angel of God, to know all things that are in the earth.

If David could discern under all coverings, and all disguise, think how open must be all the thoughts and imaginations of our hearts to his view, with whom we have to do! Hosea 4:12.