Have you ever said something like, “I believe it with all of my heart.” And you probably meant what you said to the best of your understanding. Jeremiah 17:9, “The heart is deceitful above all things and beyond cure. Who can understand it?” The context of this is someone who trusts in man is cursed while the one who trusts the Creator is blessed. In the next verse our Creator says He will search the heart and the innermost thoughts to reward mankind with what he’s deeds deserve.