The human heart, in its natural condition, is evil, treacherous and deceitful. Jeremiah 17:9 says, “The heart is deceitful above all things and beyond cure. Who can understand it?” In other words, the Fall has affected us at the deepest level; our mind, emotions and desires have been tainted by sin—and we are blind to just how pervasive the problem is.
We may not understand our own hearts, but God does. He “knows the secrets of the heart” (Psalm 44:21; see also 1 Corinthians 14:25). Jesus “knew all men, and had no need that anyone should testify of man, for He knew what was in man” (John 2:24-25). Based on His knowledge of the heart, God can judge righteously: “I, the LORD, search the heart, I test the mind, Even to give every man according to his ways, According to the fruit of his doings” (Jeremiah 17:10).
Jesus pointed out the fallen condition of our hearts in Mark 7:21-23: “From within, out of men’s hearts, come evil thoughts, sexual immorality..
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