When I read that “The heart is deceitful above all things, and desperately sick; who can understand it?” (Jeremiah 17:9), I often focus on the “desperately sick” aspect, recognizing the darkness of the human heart. But I don’t always consider the rest of the verse. Jeremiah also writes that the heart is deceitful above all things, asking, “Who can understand it?” The heart defies understanding by men. We do not know ourselves like we think we do. Thankfully, as Jeremiah shows, God searches the hearts and tests the minds of men, knowing us better than we know ourselves (Jeremiah 17:10).