Here’s one of those times I love the rendering of The Message Bible. What a way to express these verses, and how deep the truths they reveal:

The heart is hopelessly dark and deceitful, a puzzle that no one can figure out. But I, God, search the heart and examine the mind. I get to the heart of the human. I get to the root of things. I treat them as they really are, not as they pretend to be. Jeremiah 17.9,10

I have nothing else to add. Just meditate on it.