9 “The heart is deceitful above all things, and desperately wicked; Who can know it? 10 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 17:9–10, NKJV)
Now we are told why trusting in man brings the curse raised in Jeremiah 17:5-6. The heart is open to being deceived. It is where wickedness begins, and where it is housed. Jesus explained that sin comes from within us, from our hearts, and defiles us (Mark 7:20-23). The heart of which the Scriptures speak is not your blood pump, it is composed of your intellect, your will, your emotions, and your conscience. God knows the heart of every person, and He will render to every person “according to his ways.” Since our conduct proceeds from our heart, God’s judgment of us will be according to what we do (our ways, our doings). God does not say, “You have sinned, but your heart is good, therefore, everything is all right.” Instead, God says to “get yourselves a new heart and a new spirit,” that follows His will, and not your own (Ezekiel 18:31-32). Turn your heart away from sin and do God’s will. Then, both your heart and your life will be blessed by the Lord.